Go out on Via Gioliti and turn left on Via Gioberti until the Santa Maria Maggiore church, take Via Merulana until Via statuto streeth (on the left side of Merulana streeth), so walk along the streeth for 100 meters so turn to the second on the right.
From Fiumicino airport to Termini Central Station :
take the bus to Anagnina metro station, take the metro and get off at Vittorio Emanuele from there take Via dello Statuto and keep on walking for 100 meters so turn to the second on the right.