Very easy communication with Wolfram before arrival, very responsive and flexible on arrival/departure time.
Limited spoken English but we could perfectly manage to discuss the basics!
The bedroom was perfectly in line with pictures and description - even though quite small for 5 people, it was perfect for us, group of friends coming to visit Berlin and looking for a cheap accomodation!
2 bathrooms are shared with the other guests (2 other bedrooms) but no other common area expect entrance room.
Basic but clean (except a slight smell of cigarette in the entrance room only - bedroom and bathroom perfectly clean) and with everything we needed (fridge, microwave, cooker, toaster, kettle, dishes...).
Not in the center of Berlin, however in a very nice area on the East of the city (north of the East side gallery), close to an area with many bars/restaurants, however in a very very quiet street. Supermarket (Edeka) only 200m from the apartment. Metro and tramway station right close so very easy to go and visit the city!