My partner and I stayed in Marc's place for a long weekend in June. Marc was a really friendly and attentive host - he was in contact with us prior to and during our stay. He also left us with plenty of good tips on what to do - we especially enjoyed the Georgian restaurant he recommended.
The airbnb is really central and most of the main Berlin attractions are only a short walk/subway journey away. Def a good find for anyone wishing to spend some time in Berlin!