From Leonardo da Vinci (Fiumicino) airport
[ Distance: 35km ]
Take the train shuttle that runs every 20 minutes which will take you (directly, no stop) to Termini Railway Central Station. It is very fast, it takes 30 minutes. From there follow the above indications.
From Ciampino Airport
[ Distance: 20km ]
Bus + Train. A shuttle bus CO.TRA.L. connect Ciampino Airport with Ciampino Station; every 15 minutes there is a train links with Terminal Railway Station. When you are at Terminal Railway follow the above indications.