We had a fantastic time as a group of five at Daniele's place. Very easy to get to from Catania airport (You'll need a rental car, but that's really useful anyway to explore Sicily to the fullest) and Daniele even picked us up when we arrived and led the way to his place! There's restaurants and supermarkets in towns close by and both Catania and Syrakuse city centres are less than an hour away.
The place itself is fantastically located right next to the beach with your own private access - on the weekend there'll be a few more people but it never got crowded and during the week you basically have the whole beach to yourself. The house has everything you need in terms of amenities, bedrooms and bathrooms as well as a great outdoor area (we BBQ'd several times). Being right next to the sea meant there was always a nice breeze so the usual Sicilian heat didn't bother us at all - and we got some nice waves to play in to boot.
Overall a very recommended place!