We had a lovely week 5 day stay on Achill island. Cottage was simple, clean and comfortable with outside space. Host provided us with a bbq for the hot weather and there was a lovely small area by the sea for evening drinks. Great location with a near by hike with a wonderful view (ensure you have proper hiking shoes and are ready for a bit of a steep ramble near the top) very helpful and considerate hosts that are around to help anytime.
Definitely need a car to get around the island and there is 1 SuperValue, supermarket to get groceries.