The flat is located in a very convenient area, far enough away from the city centre but close enough to get there in under 20 minutes. Also it is very close to some fantastic bars and restaurants. I can particularly recommend industry standard about 10 minutes walk away. The area the flat is in is the current hip place to live in Berlin so there are lots of little places to check out.
The flat itself is very clean and exactly as described. Heinrich was very easy to deal with, he lives in the same building so key drop off was as easy as could be. Comfortable bed, good shower, fully working kitchen. No complaints.