As someone who lives in Antwerp, this museum is my number one recommendation for people visiting the city.
It is also a Unesco World Heritage site, which is very unusual for a museum. But that's because the museum occupies what historically was a printing business stretching back many many generations who had -- fortunately -- a bit of a hoarding streak.
Well worth a visit. While you're at it, 'Goodie Foodie' on the same square as the museum serves the best pancakes in the city.