From Fiumicino Airport there are train or bus to Roma Termini. From Ciampino Airport take the bus to Roma Termini or take bus to Anagnina (line A)metro Station and from Anagnina take metro Linea A until Manzoni Stop. From Tiburtina Station you can use metro line B to Roma Termini. When you are at Roma Termini you can walk for 15 minutes until via Giovanni Giolitti 387 or take metro line A until Manzoni Station or tram bus number 5 or 14 for 3 stops( Principe Eugenio/Manzoni). It is very easy.