Our stay at Gary’s flat was lovely. He was really reactive and available when we needed him and he always had a big smile on his face, making us feel very comfortable.
The flat was clean, in a quite busy street, surrounded with restaurants, shops, bars,... but the room was on the other side of the building, very quiet with a view on a tree.
It was also accessible to transport, because it only takes about 2 min walk to reach the closest u-bahn station (hermannstrasse).
Only less positive point, Gary only had one spare key, so if you are travelling with someone else, plan your days carefully.