The nearest airport is at Perugia, about a half hour drive away, served by Ryanair from Stansted. Otherwise you can use the airports at Rome, Pisa or Florence, (all about a two and a half hour drive if no problems).
San Feliciano is easily reached:
By car – take the A1 from Florence or Rome, and take the Perugia turn-off onto the Raccordo Autostradale Bettolle-Perugia; after that its the Torricella exit. This is the easiest way.
By train: There is no station at Perugia airport as it is still very small; the usual car hire firms are here though. There are reasonable train connections to Torricella or Magione from both Florence and Rome, but generally with a change, and also car hire is likely to be tricky.
We will send you more detailed instructions once your payment is received.