The room was nice and large, we were three and had also a sofa and a table that could be opened and expanded. Everything was clean, the bathroom - which was in common - was very clean too, and there’s also a little kitchen in common where you can have tea. We arrived early but the host has been very helpful: she arranged for us a place to leave our luggage and then came to check on us to see if everything was fine.
The place is not in the main city centre but it’s very near to a metro station, and you can be in Alexanderplatz in 15/20 mins.