Everything was very convenient, the top beautifully furnished, I had my own separate entrance, and the area is fantastic: close to bus, metro and S-Bahn, a great bakery, a couple of nice cafés and restaurants around, the world's best collection of surreal art (Sammlung Scharf-Gerstenberg - better than the Magritte house in Brussels!) only a couple of blocks away! Andreas is a laid-back host, check-in was really smooth and uncomplicated.
The only thing that might be remarked upon is that the textiles (bed sheets ä, curtains, and towels) had a slight smell of cold smoke although the room is a non-smoking room. I am very sensitive when it comes to smoke and it didn't disturb me too much, so I guess most people wouldn't even notice.