We (a french family with 3 kids) have spent 2 wonderful weeks in the house of Vagelis.
The location of the villa is perfect, close to Otzias beach and village.
It is peaceful (no neighbours) and the view from the terrace is beautiful (the sea on one side and the hills on the other with the view on Ioulida -the main village-
The house is brand new, clean and with everything you need (the kitchen especially is fully equipped with all and much more than you really need).
The house is stone-made and really beautiful, inside and outside. It is decorated with a lot of taste
We spent ends of afternoon relaxing and reading on the terrace and then looking at the sunset.
If you need something, you can ask Vagelis and his wife, who are really nice and helpful and will provide you the answer you need.
Kea is a nice island, with very few tourists (by comparison with other Cycaldes) and with a lot of wonderful beaches with warm and crystal clear waters. There also several footpaths (someone of them leading to beach only reachable by boat otherwise).
Those were great vacations and it was really hard to leave this place that we clearly and definitely recommend.
Axel, Sophie, Lucille, Simon & Victor