Martin was a great host, we really enjoyed staying with him. The apartment itself was beautiful, and Martin was always quick to help us with any questions. We had no complaints about staying with him.
Regarding the neighborhood, it is worth noting that the Kottbusser Tor area, which is just down the street, did not feel particularly safe when we stayed there. We were aggressively confronted by people under the influence of drugs several times, and tended to avoid the area after dark as a result. However, the neighborhood outside of Kotbusser Tor felt perfectly safe, and I wouldn't consider it a deal breaker by any means - just something to be aware of. Thank you for a great stay, Martin!