WIFI does not work.
If you come to the apartment thinking that maybe you can do something with the wifi, like connecting your computer for working a while or watching a show on Netflix when you get home after a long day climbing the beautiful city, forget about it.
Maybe you're lucky enough and you're staying in the apartment with the router (it's a shared connection for several, they told me every two apartments but... honestly, don't buy it) and if the connection is off, you can reload it and cross your fingers. But if you're not that lucky... well, you're screwed because if there's someone in the apartment with the router, that person will "stole" all the signal.
We complained and they did literally NOTHING. The guy who showed us the apartment was, at least, honest enough to tell us that he couldn't do anything. I had to "solve" it myself going up to talk to the other hosts and ask them to restart the router, wifi came back, yes it did, but sooooo low that we had problems to just watch the regular tv.
And all this without considering the lack of cleanliness of the apartment, that was something to highlight too. We had to clean all the glasses and plates before using them because they were clearly dirty. The pipe from the shower clog and also we washed the cushion's cover because they were disgusting.