Frank was a fantastic host! I stayed in two of the three rooms--the gold room and planet fassbinder--he has to offer, and they were both really great at different price points: fun and interesting art cover the walls, outfitted with extremely comfortable and warm beds (huge plus as I was here in the winter!), and both securely lock from both in and outside. The shared bathroom is stocked with linens, and he even had extra shampoos and soaps in case I needed any.
Frank was extremely helpful in recommending good places to eat and shop nearby, and was responsive to any questions I had throughout my stay.
Totally loved it, and would absolutely recommend his place to anyone coming through Berlin.