I was at Christian's place 10 nights while I was looking for a long-term accommodation in Berlin and I felt really like at home. Christian is very nice and kind. The room is very comfortable with a large bed and all the apartment is new. The location is one of the best, a few minutes by U-bahn to Alexanderplatz and the area of Prezlauer Berg is full of restaurants, cafes, supermarkets and shops...you got everything.
I totally recommend Christian, also because of his airbnb and travel experiences.
Tschüss und viel Spass