I was only able to stay in Berlin for a short period of time, but I was lucky enough to find this apartment that could accommodate my group for a couple nights. Dirk was very friendly and helpful, and his flat is lovely. We really appreciated him waking up early for our checkout and ordering a cab to take us to the airport.
Be advised that there are a few bars on the street level, and they get pretty loud throughout the night. This would not be a good place to stay for families with younger children for that reason. Also, the advertisement states that there is a washing machine in the apartment, but that is not the case (perhaps it meant dishwasher?). Regardless, it might help to clarify that.
I would certainly come here again! It was too bad that we were only able to enjoy the place for a few days.