Stayed at Evita Guest house in the off-season. The village of Vourvoulos is very quiet over winter but has a mini-mart a minute away but no restaurants open over this time.
The house is lovely- AC and cooking facilities, comfortable bed. The hot pool is great and there is a large outdoor area, it is directly on the road however so not as private as you may think.
Recommend a car/vehicle to get around, however you can walk to Fira in about 20 minutes. I think the water is Solar so can be a bit dicey to get hot water in the evening on a cloudy day.
Sofia was very accommodating with taxi pick ups and car hire and fast to reply.