After booking we received a lot of useful information about Berlin. We made a booking error, but this was changed quick and without additional cost. The appartment was as promised, large and light. It is unfortunate that the building doesn't have an elevator, but we knew that in advance. We had to pick up the keys at another location, about 1 km away. however, we could leave our luggage here until the appratment was ready (we arrived very early). The location was well connected with subway and bus. We had a very good stay in Berlin.