My partner and I spent three nights at Maria's place ("Kalamia's cozy apartment"). Maria has done an excellent job preparing the flat for Airbnb guests and, bar a couple of improvements that I suggested she could make (a few more utensils in the kitchen and thicker curtains in the bedroom), it was a super place to stay.
The flat seems to have been recently refurbished (and tastefully so) and the bed is very comfortable with lovely linens. The bathroom and its walk-in shower were just right, the hot water plentiful and the aircon very effective.
Maria checked us in and checked us out. It was a pleasure to meet her and she responded very quickly to a couple of issues that came up while we were there.
We hope very much to return to the beautiful Santorini and if we don't stay in Thira/Fera (which would be amazing but probably costly), we'd love to return to Maria's place.