We stayed at Bert's place before and after running the Berlin marathon. His apartment was in a good location, easily accessible by public transportation, yet out of the super touristy parts of Berlin. The laid-back feel of the neighborhood and the restaurants were just what we needed to have a relaxing time both before and after the marathon.
Bert was super responsive and left thoughtful touches in the apartment for us runners including showing us some medals for inspiration, some ointment for relieving leg pain and non-alcoholic beer for our taper! All in all the apartment was great and Bert was a fantastic host!