Frank's place is in an awesome neighbourhood in Berlin comparatively to many other options. It has its own set of restaurants and pubs many of which are better than the recommended spots in the city. It's quite central too as the access to the underground rail connects you to almost every part of the city.
The room is clean and hygienic.
Remember this place is all about character.
He has done it up like a dream.
Frank, himself, is an amazing person to have a conversation with and great vibe.
The experience at his place is bound to stay with you for a long time.