We can strongly recommend Carlotta's apartment. Everything about it is top class. It is in a great location -- the 245 bus is very useful and there are U and S Bahns in walking distance. The apartment itself is very good. It is very well laid out and has everything you need. It was spotlessly clean. The bed is very good. And, since it looks out onto a courtyard it is usually quiet. We had two sets of keys which was great. Carlotta was great to deal with -- very responsive in every way. We really could not have had a better apartment for our visit to Berlin, which we thoroughly enjoyed. We will certainly be back if we can get in -- the apartment is usually booked and we can see why.