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I just spent three days in Brussels in October.
This is a GREAT city for your 12 hours.
Easy train into the center city and the city core is compact and easily walkable.
Wander around the Grand Place – it’s Christmas Market season which will be pretty festive, especially after the sun goes down.
Eat chocolate, waffles, and fries and like a previous poster said Delirium Cafe is amazing if you’re a beer drinker.
Check out the touristy but cute Manneken Pis statue and duck into Poechenellekelder pub across the street.
Have fun!!!