Ralph was very prompt in responding and all went smoothly on arrival. The flat is fine for a large group that all goes to bed and gets up at the same time. We were a mixed group (teenagers and adults) and had looked long and hard for a 3-bedroom flat so the teenagers could sleep in and stay up late without disturbing others. However one of the bedrooms had no window or door and was right next to the kitchen so could not be used. So we ended up using the beds in the living room which would have been OK except that was what we'd been trying to avoid by renting a 3 bedroom flat in the first place. Otherwise facilities were fine and location is very convenient for U Bahn, shops, sightseeing etc.