On a clear day you can see the smoking top of Mt Etna from just outside the flat. A 10 minute walk gets you to the bus stop where for less than €5 you can get to the Etna cable car. Rosario also had coupons in the flat for free lunch with purchase of Etna cable car and tour. Great cafes and restaurants in the area. All in all a wonderful stay.
It is hard to find info on line, but there is a local bus (AST) to Nicolosi from the Catania train station. Taxi was €35 and scary as h***