Our daughter and SIL are in Amsterdam right now. They arrived Saturday morning and leave tomorrow, so about 4 full days. They, well SIL, limit themselves to one museum per day. They’ve done the Anne Frank House, the Resistance Museum, and VanGogh. Found lots of little bars and restaurants. The oldest Heineken bar in Amsterdam is in their hotel and SIL, who won’t drink Heineken here, enjoyed the beer there. I liked Rembrandt’s house - small and easy to get through.
Trams are easy to use & you just tap a credit card to pay.
When we were there last by ourselves, we stayed at the Dikker & Thijs hotel. Huge room, great service, just across the road from the Prinsengracht canal.
We were in Brussels years and years ago & found it forgettable. Loved Bruges, but again so long ago that it’s undoubtedly completely different.