The hotel is perfectly situated, only 15min (Bus+U7) from Tegel Airport, only 3 stops from Zoo and 4 stops from KaDeWe.
The hotel's WiFi setup is hugely problematic. Starting at 17:00 when all guests are back and until late at night, no one seems to can use the WiFi which cannot be forgiven.
Second problem, the cleaning ladies closed the heating the second date which resulted in two things (we didn't notice it immediately): We froze during the night, and because of the cold pipes, there was constant noise (I didn't manage to sleep). You do not close heating completely when its 5 degrees outside.
The hotel itself is clean, modern and renovated. We stayed in a double room. The furniture (or the absence of it) was not a problem (modern but spartan). I would have like a chair in the room but OK. Hot water was always available, and the checkin process was smooth, and the stuff friendly.
All in all I don't think I would come back at the hotel, unless the WiFi issue is fixed.