My family stayed for two nights at Paul's apartment.
The communication with Paul was flawless, he responded always within 5 minutes which was exceptional.
However, it was stated that they were 4 guests and they had just kitchenware for 2. We asked to fix this and it was fixed rapidly, although we didn't expect the house manager to come into the flat without asking, and my father was entering and it was a bit awkward.
The location is absolutely perfect. The flat is perfect for two people. For four people, as advertised, is definitely not such a good choice, as one double bed is right in front of the other and there is almost no space.
My family enjoyed their time in Berlin and the perfect location but were a bit uncomfortable, we expected a bit more for the price.