I will just repeat what others have already described: Volker is a very kind and helpful host, the description of the apartment is accurate and the apartment itself is a clean, decently and even stylishly equipped. It is true that the location might not be so attracting for those who would like to experience trendy Berlin right out of the door and for those who are afraid to even think about stepping outside of their safety social bubbles (read: immigrant neighborhood, not as clean as other parts of Berlin). For us it was a perfect week in Berlin, with everything needed (e.g. nearby markets, U-bahn and S-bahn stations a 3 minute walk from the apt) and we will be happy to repeat the experience.