The location of Martin's apartment is fantastic and I couldn't imagine staying anywhere else in Berlin! Kreuzberg is such a great neighborhood and there were so many great restaurants and breakfast places just steps away and Viktoria Park is right at the end of the block. There are two u-bahn stations about a 10-15 min walk from the apartment, but we preferred renting the electric scooters and Uber was super cheap. The apartment was very clean, spacious for a family of 4 and had all the amenities we needed, but it is a basement apartment, so there were some plumbing issues which were fixed immediately and Martin informed me a new shower was being installed after our stay. Communication with Martin was great and fast! We had a great stay in Berlin, thank you!