We strongly recommend this place.
We are a family with a 10 years old child and we stayed 15 days in the central weeks of August.
The flat is clean, silent, with full services, and very well located with respect to beaches and archeological sites.
Some people stay in Kalamaki for a few days, but with a longer stay (like ours) you will enjoy the quietness of the village and the possibility of exploring the area with relatively short trips.
Georgia is a great host and very accommodating.