Heindrik's apartment is very nice ! The place is spotless, nicely decorated and full of light ! It's a very good spot for a group if 2-4 people that would like to enjoy Berlin.
The flat is located between two tram stations, which makes easy to reach large parts of the city. Also, Prenzlauberg bars and restaurants are only withinh a 10-15 minutes walking distance.

Hendrik was also very responsive and profesional, with a nice booklet explaining the neighboorhod. The communication has always been smooth and efficient.

So in a nutshell, I would warmly recommend Hendrik's place.