Ralf and Rahmat were nice and cooperative hosts. The checkin and checkout proceedure was very smooth. The place is at a great location, the room is big, bright and comfortable, and with a very nice bathroom. If staying in Rotterdam, I would suggest the place very much. Especially if you look for a lot of privacy even if you book only a room. The latter seems, in the case of Ralf's and Rahmant's place, more as a small apartment. The only setback might be the extremely steep stairs leading to the flat, but you are warned about them when booking and should manage them easily if you're in avarage shape.