It was really nice staying at Dietrich's apartment.
Location is a bit outside the noisy city center, which is appreciable. Tram station is almost in front the flat, it will get you to Frankfurter Tor metro station. and from there almost anywhere in Berlin.
I can't say nothing about appliances in the flat, since we were only there to sleep.
The flat is a bit dark though, since direct light doesn't really come through
Mattress could be a bit more firm :)
You also have some nice places for dinner, lunch and breakfast.
A great place for breakfast I would recommend 300% : House of Do!
The service was verrrrryyyyy long, but it was worth the wait!
Dietrich was really nice and helpful, making sure we arrived well and everything was all right!