Mihaela is absolutely amazing host. Everything was clean, house is close to the beach and away from noisy people.
We had no problem to get from Trapani airport to Trapani-Porto and then to San Vito lo Capo by AST bus. You can find bus schedules here: http://www.aziendasicilianatrasporti.it:8080/
The bus stop in San Vito is next to the Mihaelas house.