Short-term rentals: the equipment that actually makes property management easier

A well-prepared home is not just a well-decorated one. In day-to-day management, the problems that cost money are rarely about looks: a key handover that goes wrong, a guest locked out at midnight, a party on a Saturday night, a cigarette smoked by the window, a small leak under the sink found three days later, air conditioning left running all day in an empty flat.

A few pieces of equipment, chosen before the property goes live, prevent a good share of these situations. The goal is not to turn the apartment into a smart home. It is to install a small number of useful tools that give the owner and the manager more control and more peace of mind, without making life harder for guests.

1. A smart lock, so you no longer depend on keys

This is the piece of equipment that changes day-to-day operations the most. Solutions such as Nuki are fitted on the inside of the door, over the existing lock, and open without a physical key: from the app, with a code on a keypad, or through a link sent to the guest.

For a short-term rental, the real value is temporary access. Each guest gets access that is valid only during their booking. Nuki documents an Airbnb integration: access is sent automatically through Airbnb messaging before arrival, becomes valid from the check-in time and is deleted after check-out. If the booking changes, the access follows. Integrations also exist with several property management systems (PMS).

The same tools work for the team: you can create access for cleaning or maintenance, limited to certain time slots, and revoke it without collecting any key. Remotely, you can check that the door is locked; with Nuki’s door sensor, you also know whether it is open or closed. Where the building allows it, this avoids a key box visible from the street.

The limits to be aware of

Not every door is compatible: the cylinder and lock need checking before you buy. In Lisbon, access to the building is often separate from access to the apartment: a smart lock on the flat’s door does not solve the street door or the intercom. And a smart lock runs on batteries: the Nuki app warns you when the level drops below 20%, but someone still has to follow up on those alerts and change the batteries between stays.

2. Spot a disturbance before the neighbour calls

In a Lisbon building, relations with the neighbours matter: repeated complaints can reach the condominium, and noise is one of the main sources of tension around Alojamento Local. A sound-level sensor alerts you when unusual noise lasts over time, so you can act quickly, often with a simple message to the guest, before things escalate.

A device such as Minut measures sound levels in decibels, like a sound meter. According to its documentation, it does not record audio: no conversation or sound is stored or transmitted. It tells you that noise went above a threshold and for how long, with no way of knowing what was said. You set the thresholds and quiet hours yourself. The alerts also leave a time-stamped record of an incident, which helps in a dispute.

This kind of device is not a microphone for listening to guests and must never be used as one. Airbnb allows sound-level monitors that do not record audio, provided they are disclosed in the listing and not placed in bedrooms or bathrooms.

3. Know that a guest is smoking before check-out

Smoking indoors is a quiet but costly problem: the smell settles into curtains, sofas and bedding, and the property can become hard to re-let straight away. Some specialised devices can now detect cigarette smoke. Minut states that its M3 sensor offers smoking detection (cigarettes and cannabis), indoors.

The benefit is being told during the stay, not when the cleaner notices the smell: you can remind the guest of the rules, limit how much the textiles absorb and document the incident. Minut’s documentation sets out the conditions: detection triggers after prolonged exposure (around 20 to 30 minutes), the sensor goes through a calibration period, and it should be placed away from windows, air conditioning and heat sources.

4. The safety equipment that is not optional

This is no longer about convenience but about legal requirements. The Alojamento Local regime (Decreto-Lei no. 128/2014, article 13) distinguishes two cases.

• Properties for 10 guests or fewer: they must have a fire extinguisher and a fire blanket accessible to occupants, accessible first-aid equipment, and the national emergency number (112) displayed in a visible place.
• Above 10 guests: the property must comply with the general fire safety regime (Decreto-Lei no. 220/2008 and the technical rules of Portaria no. 1532/2008), which is more demanding.

Beyond these requirements, we recommend a stand-alone smoke alarm in the property, especially near the bedrooms and the kitchen. It is a common-sense, inexpensive recommendation; for a property of 10 guests or fewer, it is not a requirement of article 13. Choose the extinguisher and blanket according to the property’s risks (the Civil Protection authority publishes guidance), and check their expiry dates.

5. Check your insurance before the very first booking

Insurance is often treated as a formality. That is a mistake: missing or invalid insurance is grounds for cancelling the AL registration, and the insurance validity date is now shown in the national register (RNAL). The applicable rule (article 13-A of Decreto-Lei no. 128/2014) provides in particular for:

• civil liability insurance covering material and non-material damage caused to guests and third parties through the accommodation activity, with minimum cover of €75,000 per claim;
• if the property is in a building under horizontal property (a condominium), insurance covering damage directly caused by a fire in or originating from the unit;
• joint liability of the operator with guests for damage they cause to the building.

In practice, reread your policy with four questions in mind. Is short-term letting declared and covered? Does the liability cover reach the legal minimum? Is damage caused by guests to the property itself covered, and on what terms? What are the exclusions (parties, water damage, theft without forced entry, excesses)? Standard home insurance does not necessarily cover an Alojamento Local activity.

6. Stop cooling an empty apartment

It is one of the most common forms of waste: the air conditioning runs all day while guests are out exploring the city. The hotel-style key-card holder also exists for homes: when guests leave, they take the card out, which cuts certain electrical circuits; when they come back, they put it in and everything comes back on.

Set up properly, the system cuts the air conditioning, some of the lighting and certain non-essential appliances. Guests have nothing to learn, and an empty apartment uses noticeably less energy.

You do, however, need to choose carefully what must never be cut: the fridge, the internet router if other equipment depends on it, safety devices, the smart lock and its accessories, and any appliance whose shutdown could cause a problem (freezer, pump, water heater depending on the installation). The system is wired into the fuse box, so it must be installed by a qualified electrician.

7. A small sensor that can prevent major water damage

In older buildings, water damage rarely affects just one flat: it quickly involves the neighbour below, the condominium and the insurer. Yet many claims start with a small leak that goes unnoticed, especially in an empty property between two stays.

Connected leak sensors, the size of a pebble, sit on the floor under the sink, behind the washing machine and dishwasher, at the foot of the water heater, or wherever problems have occurred before. If they detect water, they send an alert to your phone, so someone can step in or shut off the water quickly. A sensor does not prevent every problem, but it sharply reduces the time between the start of a leak and the response, and that time is often what makes the difference.

8. Keep control of the temperature without bothering guests

Where the installation allows it, a connected thermostat or air-conditioning module helps avoid excesses without imposing anything on guests: scheduling for empty periods, sensible temperature limits (for example a minimum set point in summer and a maximum in winter), open-window detection on some models, and remote monitoring.

The aim is savings and prevention, not surveillance: guests should be able to set a comfortable temperature within a reasonable range. Always check compatibility with your air-conditioning equipment before investing.

9. Always have a plan B

“Smart” does not mean “no backup plan”. A smart lock can run out of battery, a phone can die, a code can be mistyped, the power or network can go down. Before the first booking, make sure you have:

• a backup access solution, for example a mechanical key kept somewhere secure, never under the doormat;
• a low-battery procedure: who receives the alert, and who changes the batteries, and when;
• a reachable contact during arrival hours, including in the evening;
• a simple protocol if a guest loses access: what to tell them, who goes over, and how quickly.

If we had to equip an apartment tomorrow

This is the order in which we think it through, property by property. Not everything is needed everywhere: a ground-floor studio and a two-bedroom flat with a terrace do not call for the same choices.

The best time to think about this equipment? Before the renovation.

When an owner renovates a property intended for short-term rental, it is the ideal moment to plan ahead. Adding a power supply, a location or a cable run during the works costs little; coming back afterwards and cutting into a freshly painted wall costs far more.

During the works, think in particular about: the door and lock (compatibility with a smart lock), where the Wi-Fi router goes so it covers the whole flat, the fuse box and the circuits you will want to cut separately, air conditioning, where the sensors and alarms will sit, water points and their accessibility, sockets and lighting, and a lockable storage space for linen and cleaning supplies. If an access system is needed at the building entrance, this is also the time to raise it with the condominium.

Go further: the checklist to get your apartment ready and what to do when a guest damages your property.