Good, comfortable accomodation is available at:
Naples (CAP) Is the closest international airport. There are several connections from Naples to Procida via ferry or fastboat. Check this Timetable or download the Uno Procida Residente app.
Maria's mother has kindly volunteered to organize taxi pick-up for everyone. Please look into this spreadsheet to see where / when you should be located for the pick-up. If you'd rather go on your own, just let us know!
If you've got any question or doubt on logistics, feel free to reach out at mariaandmartino@gmail.com.