Guiseppe's place is exactly why you're here looking on AirBnB. It is a remote and unexpected paradise. The property was sparkling clean and Giuseppe and his wife were absolutely lovely. Note that they do not speak English, but are adept at Google Translate which was 100% fine for our needs.
The house is massive and boasts spectacular views of the coast and the Valley of the Temples, which is a must visit. Waking up every morning to the view (and the donkey and goats on the farms below the house) was a joy. Note that the property is remote and requires driving up mountain roads that are not for the faint of heart. That said, you're 10-20m drive from Agrigento city center and nearby beaches.
There is a positively lovely restaurant (Gardenia Pizza) two minutes from the house where you can pick up essentials and get a delicious late night snack. I cannot wait to go back.