This wee AirBnB is so sweet. My sister & I stayed here for a week one summer. The middle photos is the room we stayed in but there are other options. Breakfast is provided but you will have to go out to eat lunch or dinner. I will suggest food spots in due course.
If it's not available here are some other options:
The Bouthouse - The Boathouse a truly unique and stunning property - Tiny houses for Rent in Kildonan, Scotland, United Kingdom - Airbnb
The Douglas Hotel - Welcome to The Douglas Hotel, Arran - The Douglas Hotel, Isle of Arran
Lamlash Bay Hotel - Lamlash Bay Hotel | Best Rates Direct | Isle of Arran | Scotland