We had a great stay here. Prenzl'berg is a great neighborhood full of restaurants and cafes. We were regulars at Babel, a bar across the street, and loved trying all the cafes along Hufelandstraße. The Friedrichshain park and biergarten were great when the weather was nice.
The layout of the apartment means that anyone staying in the bedroom with two twin beds has to walk through the main room to get to the bathroom, so something to know if you're more than two people. Also, there bathroom is very small by American standards! But all part of the authentic European experience :)
Otto and Petra were incredibly helpful with the few other things that came up (translating things into German for us, etc.) Thank you!!!