Communication with Rainer was excellent. I asked that he leave me a bit of laundry detergent so I could wash my clothes (I had been hiking for over a week, so arrived with no clean clothes), and was happy to find a couple of laundry tablets awaiting me on arrival. The apartment is spacious, well-lit (lots of windows), comfortably furnished, and ventilated from several directions, so the heat wave that greeted me in Berlin (30+ degrees C) was quite tolerable. The kitchen is well equipped, bed very comfortable, and bathroom was large and clean. Location, for my purposes, was excellent.