Main problem: noise. The thin window couldn't stop the noises coming from the busy street, especially motorbikes and sirens at night.
The heater turned off by itself several times a day. When contacted the host was reactive but couldn't solve the problem. I could solve it by (almost) randomly hiting the heater keys.
It's an old building and room. There are stains on the walls and the floor in the room isn't flat.
Positive: it's all very clean and cleaned several times a day. The room is large and the shared kitchen is well equiped.