As I live in a village between your previous article of Ghent and tbis one, I definitely like it that you enjoyed both cities!
As already pointed out by others, I wouldn't really call Antwerp a hidden gem, though it's definitely a nice city to walk around!
Not sure if you've visited 'Mechelen' already? In my opinion it's much more a hidden gem! ;D
Unfortunately I didn't get to visit Mechelen, maybe next time.