We had a lovely stay at Ralf and Rahmats house. The upstairs room is decorated and furnished very lovely and tasteful and has all the amenities of a hotel room (like a minibar and free coffee). The view from the balcony is terrific. We didn't see Ralf and Rahmat often (we stayed during a work week), but they were always nice and helpful. If we visit Rotterdam again someday, this would be our Airbnb of choice.