Clematisso is a youth hostel that is easily the best solution for travellers looking for a simple, yet decent place to spend the night before catching a plane (going to the airport by car is less than 10 min) or to settle down before visiting Bastia or the area.
It is run by a charming couple who also offers a cheap shuttle service between the airport and their place, in both directions. The place is clean, calm, and overall cosy. The location by the sea might best suit travellers between June and August, as September sees the end of the tourist season and then the camping park might look a bit empty to some.
I would definitely recommend Clematisso to anyone who desires to meet hospitable and nice people away from the buzz of large hotels.