I stayed with Marion for a couple of months. During my stay with her, she was very nice and kind. She addressed all of my concerns. It was easy to communicate with her and she respected my personal space. Occasionally, I spent time with her talking about art, travel, and life in general, and about Oskar, her lovely cat.
The size of the room is more than enough for one person, and I liked that it has a big window to let in enough light. The room is also adjacent to a terrace which I can use whenever I want. There is also a kitchen and a shower on the same floor.
The location of her house is very accessible. It is about a 5 min walk to the nearest tram station, and about 15-20 mins to the central station and to the city center.
If ever I have another chance to visit Rotterdam, I would definitely stay with her again.