Cinzia's house is lovely, super-clean, well equipped and views to die for, and she is a very helpful and positive host. We got a parking ticket and Cinzia took it to the post office for us to pay it, which was brilliant.
The location is a fair walk from Castelmola centre (10 mins) with steep hills involved and the access road is steep and narrow. If you don't mind that, it's perfect. (And watch out for parking police in Castelmola!).
A tip - try out the Chiccirichi Ristorante - Cinzia's recommendation - Amazing.