I can only recommend to stay in one of the beautiful houses of Vasilis, Gill and Emily! I have experienced a great hospitality, a very warm welcome and Emily was always available for questions. This very clean and nice house has made my stay in Santorini as perfect as I could be. The location is amazing as you are very close to the center of Oia but still private enough to sit on your terrace in peace ;)
I think I do not have to mention the bread service every morning, as people already pointed out before but this little details where just so so nice!