This is a great place to stay and I can just recommend it to everyone! The small house is super cozywith the large (shaded) terrace (which also protects to from the rain, if have rainy days), the surrounding garden that gives you sufficient privacy, the outdoor shower (we never showered in-door), outdoor kitchen (which we used a couple of times) and BBQ grill option, as well as the close and direct sea access (vulcanic rock, no beach in the classical sense). There are good sea food restaurant in walking distance and a large super market close by (and there is car in town at certain times, of which you can buy local fruit and vergetables). Stefania is super nice and easy to communicate with, responds quickly and was very helpful overall, whenever we had questions and asks.
If you don't have a rental car (like us), getting around is a bit tricky but not impossible if you don't mind walking. There is a bus (534) to Catania which goes at certain times from Aci Trezza, but you need to walk to the bus station there (about 30 min walk). Other buses shown in Moovit proved a bit...unreliable. The way to the train station in Acireale (to go to Catania or Taourmina or father away) is along a highly frequented road and takes you 45 min at least to get there. If that is too far for you ask Stefania for help :)
We enjoyed our stay (a little more than 2 weeks) very much!