Air In Berlin is an older hotel, but quite a few modern accomodations and good wifi too. The breakfast is good too. Its small, the elevator is a little strange and not actually going to the floor, but the half floor at the turn in the staircase.
I would stay there again, its close to where I needed to be, the no air conditioning was not too bad as the windows opened wide, etc.
There was demolition taking place two doors down. I understand as the demo moves closer, it will include the Air In Berlin hotel as well making way for progress.