My wife and I and 2-year old stayed here for 10 nights. We really loved this place. The outdoor areas were great, especially the BBQ facilities; and the house was cool in the heat.
The location excelled our expectations -- the landscape of beach and mountain is stunning. We used many local beaches, and also travelled as far as Marsala and Scopello. We would thoroughly recommend the hike to Cala Tonnarella dell'Uzzo beach at the north end of Riserva Zingaro.
One thing that might be appreciated by other guests with families is info for where to eat in the early evening: we discovered Azzurra in Makari (from 18:30) and Trattoria Delfino in San Vito Lo Capo (all day).
Thanks to Mario for great hospitality and assistance.