We have just spent 10 nights in this lovely spacious apartment, it exceeded our expectations. The situation is fantastic, only a few mins to walk to the river, shops, restaurants and supermarkets. The railway station, S bahn, and U bahn are also only 5 mins walk from the apartment and I was amazed at the number of bakeries and other shops in the station complex. We were able to walk to almost anywhere we wanted to go. Because the apartment is at the back of an internal courtyard it is very quiet.
Elfie and Pablo were always very prompt in answering any communication and although we didn't get to meet them personally their friend Dagmar who checked us in spoke excellent English and was extremely helpful. If we ever have the opportunity to visit Berlin again we would definitely stay there.