We're partial to Westpunt......

Andreas or Bryan can give you info on the All West Apartments. I know they have 2 bedroom apartments but can certainly sleep 3. They have tanks available 24/7 and are affiliated with Ocean Encounters WEST.
Marazul Condos have 3 bedroom units but do not have an on site dive op.
We have a 3 bedroom apartment at Sunshine Getaway.
There are apartments at Nos Kuseros across from OEW. They have 2 bedroom units but most likely can sleep 3.
The Lodge Kura Hulanda is high end and located right next to OEW.
There are others but this will give you a start.
There are villas at Coral Estates in St. Wilibrordus. As of now Habitat Hotel and the dive shop is closed. Who knows next year?
There are quite a few condos in Lagun at Lagun Blou and Lagun Ocean and apartments at Bahia Inn and the Dolphin Heart House.
The dive ops in Lagun are Discover Diving and Bahia Inn Diving.
If you stay in/around Willemstad, Mark and Suzy at the Dive Bus now have 3 studios... and cold Polars.....
That'll give you a start.