The Casa di Goethe is in the center of Rome:
Via del Corso 18 (Piazza del Popolo), first floor

Access for disabled: 59 cm width of elevator door

Bus 52, 53, 63, 60, 61, 62, 175, 204, 25, 45, 490, 495, 88, 117, 118. 
See also www.atac.roma.it

Metro A,· "Flaminio" stop
Villa Borghese Parking