I represent one half of three couples who spent five nights in Alessandro's Nicolosi AirBnB and we had an excellent time and would recommend it highly. First of all, Alessandro is a wonderful host, who communicated clearly and sent precise instructions about how to find the house. He met us when we first arrived to show us around the house and then he drove us to Nicolosi--five minutes away by car, and a twenty-minute walk--to show us the town, and even waited while we went food shopping. He always answered our questions immediately and couldn't have been more helpful. He even made a reservation for us at a restaurant when we asked him. He is the perfect host.
Second, the outside area by the pool is the primary glory of the house. The pool is large and clean and lovely, there is ample room to sit around the expansive outdoor space, and the large table under an awning is the perfect place to eat your meals outside. The house itself is very comfortable, with lots of room, a washing machine, and a large TV that offers Netflix. The kitchen isn't perfect, but we cooked many meals there with an useable supply of pots and pans and efficient stove top and oven.
Finally, if seeing Etna is your reason for renting this house, you could hardly be in a better place. Nicolosi is a charming village, fun to walk around, and home to a serious and excellent steakhouse, La Chianina, which Allesandro recommended and where we ate a terrific meal. From Nicolosi you can drive to the top of Etna in 25 minutes, or bike there, perhaps in under the two hours and a half hours it took us.
We had a lovely time at Alessandro's AirBnB.