Willemstad is a nice place with two sides. Punda on one side and Otrabanda ( probably literally other side, but what do I know? ) on the other side and a zillion different neighborhoods scattered around that.
Punda is the rich and more touristy side of town while Otrabanda is more local, moor poor and more ruined. Still the ambiance that the place radiates is great. There are a bunch of cheap eateries and bars (my tip would be the netto bar or one of the many snackies) and almost all the time you can find locals there having a beer and a chat. A lot of time including us.