We had a great time at David's apartment. We met him at his apartment after that he gave us an introduction of the house.
The house looks pretty good with his own paintings. It was large enough for 4 people, only the shower and the toilet don't have much space but i we could live with that.
I only would say that the wifi is poor, sometimes it was okay but we had many disconnections. Overall we had a good time in Berlin and i would advice this place!