I was in town for a conference and had a lovely stay at Arjan's place. Even with a newly broken bone, he was a great host and did his best to be as hospitable as possible! The garden room is just as in the photos.
The apartment is a bit south of the centre, but close to public transit and everything is really accessible. I rented a bike for the week and got around that way, and it was perfect - makes everything very close!