The flat is as described in the pictures, or maybe even better. It is clean, modern, complete with all the essentials and even more, especially in the kitchen: many pans and saucepans, olive oil, salt, pepper, pasta to get you started for the first dinner, coffee, a coffee pot to get you started the first morning, a bottle of water and even a welcome sparkling wine.
Also worth noting: you will find quality furniture and appliances. Not basic IKEA stuff, you can see effort has been put in making a place they would themselves want to live in. It's not always the case with airbnb.
It is not entirely clear in the description but there are two separate bedrooms as well as the kitchen/dining area, the bathroom and the balcony. The second bedroom is pretty small and has a convertible couch and a desk, but this was enough to put the baby bed (provided by our host) for our daughter so it's all we needed!
Grazziano has been really helpful and patient with all my questions and his dad who took us to the flat was very friendly as well.
Castemola is a really pretty town with an amazing view on the sea, the Etna, and the amazing Sicily landscape!
Just beware that it's even further up the hill/mountain than Taormina so you have to count maybe 20mn of winding roads up from the motorway. I say it's worth it but keep this in mind when planning travel times to your day trips.
The town is calm and quiet (at least it was at Easter!) but don't expect full silence: the bells are ringing every quarter hour (not at night of course but from about 7am), and you can hear cats and neighbours talking or watching TV in the evenings. But nothing that will prevent you from sleeping, it's just part of the life in the village!
Thank you very much Grazziano and his parents and to you reading this review: go for it and enjoy your trip (you will) :)