Our time at this apartment was fantastic. We arrived at Norbanhof station late in the evening and Carina (Moritz' neighbour - as he was out of town) came and met us and walked us to the apartment - which really is a stones throw away.
The actual apartment was so clean and felt brand new. We had absolutely no issues with the apartment and loved spending time there. The front door has an electric metal blind on the exterior and is part of a gated community which made us feel very secure.
Moritz was very helpful in advance of our stay, emailing us with tips and tricks to enjoy our stay to the maximum and there is a book of information upon arrival.
The location of the apartment is just two or three s-bahn (overground) stops away from very central Berlin and the public transport is very cheap so this worked great.
Our departing flight was in the evening and so when we had to check out Moritz worked around our timing, which we greatly appreciated.
Overall the stay was up there with the best, we loved this apartment and our stay in Berlin.