We had a delightful week at Andrea and family's 'shepherd's hut'. It has everything you might need, is quite spacious, has a verandah overlooking the pool and, far beyond, the sea. The family are hugely friendly and treated us, the day after we arrived , to the full Sicilian family meal at their house which is just 100m further down the hill. Andrea also works at a winery so we visited there for an afternoon.
Obviously you need a car to get around and it is a bit of a trek to the sea but then you get the advantages of being on Etna! We can thoroughly recommend the trip up the mountain; it's £50/63 euro per person but that includes the cable car, jeep and guide.
We would certainly consider going again to this property and can endorse all the other reviews recommending it.