Myself and my 20 year old daughter had a short 3 night stay in Dominik's flat. The communication before arrival was excellent and prompt. The key collection is at a handy location 2 mins from the flat. The flat itself is in a great location within Mitte. We enjoy walking everywhere especially in the summer and all the major tourist spots were roughly a 20-25 minute stroll in the sun. There are lots of handy grocery shops, small bars and restaurants for all tastes within a 5 to 10 min walk. Again on departure we just dropped the key off at the collection point. I would highly recommend Dominik's flat if you are looking to stay in a very central (although quiet), very clean, sunny and well organised apartment.