Horst and his wife welcomed us warmly despite our late arrival due to very heavy traffic.
The house is situated in a very rural-like residential area. The apartment has a separate entrance at the opposite end of the building.
The apartment itself is small but very functional and has all basic amenities for a comfortable one-night stay. Don't be discouraged by the photo of the bed standing next to the entrance - first, the house is being kept really warm (when we arrived the heating system was still on); second, there are thick curtains between the little entrance hall and the room.
There's an airport and a railroad nearby (well, that's Berlin after all) but the occasional noise of passing trains or planes didn't bother us much.