Hi there!!! I used to live in Antigua, love the island and love the simple life there.
I think if you planning to move the important things to consider is health insurance, the minor issues are ok to handle in the island but in my experience if there is something more serious you need to go out of the island, I learn that from the locals...
Buying, property is expensive and as a non citizen you will pay a tax because if that.
Where.... I will look for a safe area, crosbies use to be very safe, but go around, look for see views, jolly Harbour , English Harbour... Are the usual, but there is plenty of places... Good luck!!