There is approx. 15 kilometres between Ciampino airport and the centre of Rome. The taxi drivers are notoriously known for ripping of tourists on the drive from Ciampino in to Rome, so book your airport transfer here instead and avoid the hassle of taxis.
Fiumicino airport, also known as Leonardo da Vinci International Airport, is Italy's largest airport and situated about 25 km outside of the center of Rome. On this site you can book your airport transfer from Fiumicino airport to your hotel in Rome.