Trudy's place was excellent! The apartment is spacious, clean and comfortable. Location is also perfect for us, near metro station in a nice neighbourhood. I would recommend you to stay here. Communication was also very easy. One concern is as you can't put your luggages before/after check in time, you need to plan carefully. The lockers in Alexanderplatz that Trudy suggested to store your luggage happens to be full even in the morning on weekdays.