Staying at Phuong and Martin house was great! The room was very clean and nice, and the localization is really great - only 7 minutes by walk to S-Bahn station, which was important to us, tourist full time :D The area is full of green and very quiet, ideal to relax after whole day of sightseeing :) Phoung and Martin are very nice hosts, definitely recommend staying at their's if you are looking for a great place on your city break in Berlin!