The room has the size and the charm of a prison cell with basically nothing but the bed. But this was not the problem since we didn't expect anything more and used the room only to sleep. The kitchen was even well-equipped.
The problem was that the water which came out of the shower was boiling and it was not possible to turn down the temperature, so we couldn't use the shower.
We tried to contact the owner in multiple ways (via AirBnB, via two different numbers which they left) but they didn't respond. Moreover, the ventilator in the bathroom didn't work neither.