There is very little I can add to the good reviews in Tripadvisor. I have stayed in the van der Valk Hotel during 3 - 4 annual trips. My experience is very positive. I agree that the rooms are really excellent and clean. The restaurant offers a good breakfast and the place is perfect to invite your friends or business contacts to enjoy lunch or dinner. I will stay another 2 - 3 nights next year.
Indeed, the WiFI is less than perfect.