From Termini station you can take the bus 64 or 40 until the Vatican Bridge and then you can reach the apartment walking, or the bus number 40, 64 till Torre Argentina, and From there take a Tram number 8 till Viale Trastevere.

From Leonardo da Vinci (Fiumicino) airport:

Take the train shuttle that runs every 20 minutes which will take you (directly, no stop) to Termini railway central station. We have the shuttle service from the airport Fiumicino and Ciampino directly to the apartment and viceversa.

Bus + Train. A shuttle bus CO.TRA.L. connect Ciampino airport with Ciampino railway station; every 15 minutes there is a train links with Termini railway sation.

We have also the shuttle bus from Ciampino airport directly to your flat and viceversa.