Simply perfect.
The apartment - Finished to very high standard. From the shower tiles over the bed to the kitchen appliances. In every detail. Far less could have been spent by the hosts to create good value. They spent more. They made it compelling. My respect.
The view - Outstanding. Just what non-coastal Central Europeans look for ;).
The vicinity - Wonderful small town with very friendly residents, great joie-de-vivre & down-to-earth lifestyle, quality food (try Taverna dell'Etna), a 15-minute car ride to Isolla Bella beach and pretty Taormina in one of the best, if not the best, areas of Sicily and in fine proximity of Mount Etna.
The hosts - Simply lovely. Gentle, educated, professional, personal, respectful.
Conclusion: do it.