Sunset House Hotel & Dive Center
My wife have been to Sunset House 3 times now. It's a perfect environment for divers. Great shore dives; wet lockers to store your gear and friendly and knowledgeable staff at Sunset Divers.
If you are into underwater photography, Cathy Church Photo Center is on site. All staff not only are able photographers but also divemasters. Great wall and shallow reef dives.
It's a short 15 minute walk into George Town and there are many great restaurants so there is no need for a car. If you want to explore 7 Mile beach, hop a bus in George Town. Cheap and you can flag them down. My wife and I are already planning our next trip.