The apartment was clean and spacious, and the location is great (a few minutes walk to every EU institution or the nearest metro station). The bed is super cozy! The host was flexible in arranging our arrival a few hours earlier than the usual check-in.
The heating in the apartment didn't work, but there was an electric heater which we used instead. This worked, but it wasn't able to heat the main room and the bathroom as well, so it wasn't really convenient. When we asked the host about it, we didn't get a response until the next day. A few times we received an automatic reply from the host which didn't really answer our questions, so we had to wait for the host to respond again.
All in all, if there were no problems with the heating, this would have been a perfect stay.