We stayed for 3 nights, the view from the studio is breathtaking and all facilities provided were great. The studio is actually quite long, being a cave apartment allowing one to have privacy from the bed to the forward day beds. It never felt cramped in, although one spends the whole time on the balcony admiring the views.
One restaurant tip, Aktaion at the square of Gerasimos... best Greek food we had on Santorini