Once you have reached Rome outer limits, take the ring road “GRA-Grande Raccordo Anulare”. Follow signs to and exit Roma Centro/Vatican City/Aurelia (Exit 1). Keep going straight on Via Aurelia and follow signs to Piazza San Giovanni Battista della Salle and Piazza di Villa Carpegna. Once you get there, turn left on Via della Madonna del Riposo, keep going straight, following signs to Ospedale San Carlo di Nancy (Hospital) on Via Aurelia. You will soon reach Via Aurelia, 190.