Hi Kevin,
We stayed at the Kaloudis this year, early October. At the side of the pool is a small tree which bears a dark red/brown fruit. About the size of a large cherry, texture of an apple, the skin was quite tough. Tried tasting a couple but wouldn't say they were particularly nice. Pretty sure they were ripe as they had started to fall off the tree. There is the same but smaller tree outside the older building behind Gratzela.
Do you have an idea of what they are.