With airplane:
From the international airport of Rome-Fiumicino take the train for Rome Ostiense (10 minutes)
With the train:
From all of Rome's railway station take the train for Rome Ostiense (10-15 minutes)
With subway:
Take the B lines (Blue lines) and get off at Garbatella stop
Other connections:
3 subway's stop (B Lines) from the Colosseum
5 subway's stop (B Lines) from the central railway station of Rome Termini
Direct line with Piazza Venezia (Bus nr. 716 - 10 minutes circa)