Ralf and Rahmat’s place is like a private hotel. We enjoyed a lot our staying at their attic apartment. The place is really clean, nicely designed, comfy and it has a charm :) The hosts are really friendly, they even served welcome drinks for us. In the room there are great books about Rotterdam, focusing on architecture and design.
Check-in and check-out was super smooth, I would book this place again if we went to Rotterdam again.