The Muse of Santorini is good value for money. We were a family of 4 (2 small children), and Antonis offered to give us a larger suite on the second floor, but we much preferred the single bedroom units on the ground level. The bed was really big and fit all of us comfortably. It was comfortable, modern and felt quite new, we enjoyed our stay there.
Antonis was extremely responsive to all our needs, he helped us get a car for rent as well, and was available at all times whenever we needed.
The location is great if you dont want to stay in central Fira, its a short drive to most major tourist spots, but then renting a vehicle is necessary. Nice eateries, plenty of supermarkets are situated around at a short walk, and the area is quiet and safe.
We enjoyed our stay here, would highly recommend it to others as well.