We liked Go West - a lot. Good facility, lockers, shower, changing room etc. They're on Playa Kalki/Alice in Wonderland - IMO one of the best shore dives we did all week. Also they boat dive Watamula since it's nearby - supposed to be among the best of Curacao. Nice people run it - very accommodating. We didn't rent from them but their gear looked in good shape also. If you dive DIN, they had convertible tank valves.
Staying out there you'd want a car. It's about a 45min. drive back to Willemstad from there. Many of the good shore dive sites are between Westpunt and Willemstad. Also there's limited food options out there, Lodge Kura Hulanda has a restaurant and there's maybe 1/2 dozen others. A couple small markets along the road back to town so some people get food in Willemstad before driving out - we did when we stayed in Lagun nearby. It's really quiet in Westpunt at night.