For Dutch go here: bezoeken.
The museum is open on Wednesday, Thursday and Friday from 13:00 to 17:00 hours or on any other day or evening by appointment made by e-mail or by phone:
Entry fee is € 5 per person and € 40 for groups of 8-20. Students (everybody younger than 27 we consider as such) have free access. The location of the museum is on the fourth floor of an office building near Leidseplein at Korte Leidsedwarsstraat 12, 1017 RC Amsterdam.