Christian is a very friendly and accommodating host. The flat is in perfectly central location. The room was also very nice and clean, even with balcony looking out to the river, would be very beautiful in the summer.
We came in winter when It was freezing cold outside (Berli had a few very cold days -10 degrees, but felt temperature -241), but the room was still nice and cosy warm, really well insulated with double glazed windows/balcony doors.
My boyfriend and me just stayed for one night, but it was very pleasant, all in all a short and sweet stay. I would definitely recommend. Thanks Christian!