I agree that this is difficult to find, but it is a gem. A beautiful house and garden with the added bonus of some lovely artworks including a Bosch!!! Also included in the ridiculously cheap entrance fee is the beguinage which is also one of the best preserved.
I found this small museum eventually, it being surprisingly difficult to find even though it's only 5 minutes from the Metro. For some reason, very few locals seemed to have heard of it. I also got the impression upon arrival that the museum was closed, so it seemed to be a bit of a waste of time.
Persevere though (open...