We had a lovely stay at Willem's place. It is located close to the grachts and there is a bus stop 2 min walk from the apartment which takes you to the central station.
It was easy to get in with the instructions sent via email by Willem.
Great location, but bear in mind that there is a pub right next door which is noisy on weekend nights so if you like to take it easy in the evenings this might be an issue.
The apartment is decorated in retro style and has everything one needs for a few day's stay - you can even cook your own meals!
Comfy bed and nice shower!