You get top bang for buck in Daniela's home. It's clean, large, has WiFi, a separate kitchen and an air conditioning unit in the master bedroom, so you're all set up.
Daniela and her parents will help you every which way you can and we felt very welcome :)
Trappeto itself is quite small, typical italian suburb with some restaurants, two supermarkets (try the homebrewed Zibbibo from "Pegasus") and an exceptionally good chicken grill.
The location is a good starting point for excursions and visits to Palermo, Trapani, Castellamare del Golfo, Erice Antica (!), Segesta, and Seliunt (archeological sites). But you WILL need a car to get around, as Daniela correctly points out herself. So we saw a lot of western sicily and found some nice beaches, even though those aren't right out of the door. Trappetos home beaches vary from "meh" to "very nice", but do try and visit Torre Salsa in the south once or twice, trust me ;)
All in all I'd definitely recommend staying here - if you're mobile and are not afraid to use the car :)