Someone broke in while we were staying here with the key to both deadbolted doors. I understand that crime in a city is crime in a city, and some aspect of the experience we had was bad luck, but it gives me no comfort that the person who greeted us and gave us the keys was not the host or anyone there was any mention of on the AirBnB listing.
Even before we had the unfortunate experience of witnessing a stranger crack open our door at 3am (it was only luck that I was awake), we had been shivering in the apartment, which had a very inadequate heater for the amount of space and the large window. We asked the host's "friend" who was managing the listing to help at 7:30 pm; he responded at 8pm that he was coming with a space heater. After hearing nothing, I replied at 10pm that it was too late and we were going to try to sleep (which I failed at) to catch our flight the next morning, to which he unhelpfully responded that he would bring the space heater the next morning. Unable to sleep, I stayed up and went to bed around 2:45am when the WiFi cut out; I didn't realize then that it was part of a targeted break-in. After my boyfriend chased the thief away, we started collecting our things and realized the lights weren't turning on; the power to our apartment had been cut, but the hallway and rest of the building was fine. I contacted AirBnB and relocated to a hotel.
Dani, the host, was genuinely shaken when I recounted the night's events after I got his phone number the next day (I only had his friend's number before), but I still don't recommend staying here or anywhere where one or more of the hosts appears to be an informal property manager and is associated with an abundance of listings--there's little to no accountability for anyone beyond the host, which is dangerous in a city like Madrid. If the person who's meeting you isn't the person on the listing and that comes as a surprise, just leave and find a hotel.