From Termini railway station
Exit the station from the side of Piazza dei Cinquecento.
Take the number 40 Express Bus (it leaves every 5 mins) and get off at Piazza Venezia after three stops.
Turn left into Piazza SS. Apostoli, walk for 50 m through the square and turn right into Via del Vaccaro, which, leads into Piazza della Pilotta.
The Conference Centre is situated on the upper side of the square, inside the Pontifical Gregorian University.
Metro underground trains
Inside the station, take the A-line subway for 2 stops and get off at BARBERINI (continue on foot for approximately 800 m until you reach Piazza della Pilotta)
Or the B-line subway for 1 stop and get off at CAVOUR (then on foot for approximately 1.2 km)