We really felt at home in Martin's comfortable apartment. He met us and gave us a good introduction to the apartment and the area, including a map with locations (grocery stores, transportation, cafes, etc) marked on it. It was great to be in the middle of Berlin and less than 5 minutes walk to an U-Bahn station to get anywhere in the city. You can also take a little longer walk easily to some tourist destinations like the Berlin cathedral, Nikolaiviertel, And Alexanderplatz. I would recommend a stay here if you're visiting Berlin.