Externally small, but very comfortable hotel, in a nice and rather quiet area. Our room was big and tidy, seemingly one of the biggest available, and had a modern bathroom, matching the pictures. Service was very friendly, better than in most of the places we visited in Berlin, both in attitude and language skills. Room had coffee, water heater and a minibar, which were great. I could definitely return here again.
The only downside was that the hotel stuff didn't seem to know what Berlin City Tax really means, and wasn't prepared to reduce that from the bill, due to room being reserved via "travel agent" (=HC). Hotels do not own that money anyways. Didn't want to spend too much time on that as the amount was insignifant.