Our experience at Joop's place was wonderful. Joop was very nice and responded quickly to all of our messages. He was at the apartment to greet us but didn't bother us for the rest of our stay either.
When we arrived we were welcomed with a bottle of wine and delicious stroop waffles.
The apartment was very cozy, the bed was large and comfortable and there were clean sheets and towels to our use.
The location was great: not loud but in the center, walking distance from everything.
The only thing that was a little discomfort for us with the apartment is that the toilets and shower were outside of the room, in the end of the corridor, which made us cross the mutual staircase with rest of the house. Although it wasn't a very big discomfort because the upper staircase which leads to the rest house was always closed, and we didn't bump into anybody during our stay.
Overall we strongly recommend staying at Joop house.