The apartment: fantastic location in Friedrichshain, a very lively yet family-friendly neighbourhood with plenty to see and do. There is a tram on the street outside, (M13) and the apartment is walking distance from Warschauer Str. train station (10 mins), although I also walked to Frankfurter Tor daily (about 15 minutes, through a lovely neighbourhood). The apartment itself is very bright and clean, with modern fixtures. The wifi is fast and has a good signal throughout. The room is large, with a double bed and a double fold-out bed. I slept very well for 2 weeks on the bed, which has a really comfortable, firm (not too firm) mattress. The room also has a large desk which I used everyday. Even with this furniture the room still feels spacious. The room also has its own door, which is very convenient to not disturb anyone else in the house. The bathroom was always clean and has a washing machine, and there's a fully functional kitchen with dishwasher.
The apartment is on the 5th floor with no lift, but those without mobility issues will not have a problem. Plus you get the best view of the apartment's courtyard from the room :)
The hosts: Ivo and family were really communicative and flexible about check-in and check-out, both were incredibly easy. During the stay they were always really happy to interact and are really lovely people. They're also perfectly happy to just respect your privacy if that's what you're after.
5 stars, would stay again without hesitation!