Stanley is a very enjoyable location to live. One only needs to spend an afternoon out front of the Smugglers Inn on the water front, and see first hand how friendly people are. As they walk by with their dogs etc etc etc.
It's quiet a nice position, and worth the 30 minutes commute time.
Whether Repluse Bay or Stanley are any less busy during the summer months ( Repulse bay is one of the most popular Sth island beaches ) is debatable. They are no busier than any other touristy expat enclave, Discovery bay, Sai Kung and Gold Coast are equally busy during summer weekends around the malls etc etc.
All part of the Hong Kong experience.