We (2 young couples) will happily recommend this place! We stayed for 4 nights and it was a brilliant base to see Amsterdam. We walked to the city centre everyday (around 30 minutes), but the local nabourhood was cozy in itself. The rooms are good, including the kitchen and bathroom. Martijn was very helpful and friendly.
One little thing is that we visited during a very hot week (around 30 degrees celsius everyday) so we would have liked a fan og two more. Only one of the bedrooms had a fan. But if you visit the city with a more "normal" temperature then i'm sure everything is perfect.
All in all we have been very happy to stay in this place!