We had a delightful stay at Kostas' villa. It is exactly as advertised: a clean and modern villa, very well-styled and well-designed, with beautiful wooden ceilings; the villa is located conveniently nearby the wonderful town of Batsi in a calm location (but with several neighbours - so not completely isolated).
Kostas is an excellent host. He is very responsive on messages and always replied promptly. Check-in was face-to-face as it is not that easy to find the villa without being escorted there from the main road. Kostas is also very flexible in making convenient arrangements, for example he provided beach towels and a great selection of breakfast snacks to eat on one of the very pleasant terraces overlooking the sea.
Andros can be a windy island, but when the sun shines it is beautiful and can be very warm. We were very fortunate during our stay to have a largely wind-free, sunny period. During hot weather, the villa can be a bit of a challenge to keep cool as there is only one air conditioner unit in the main bedroom (that is not that powerful). We managed by keeping the shutters of windows of the main core of the house closed during the day and cooling it that way.
Overall, highly recommended!