If you are taking a bus operated by Gaspari or FlixBus, please note that they stop at the "Amiternum/My Suite" bus stop, which is 4 km from the city center.
To reach the GSSI or the city center by public transport, take line "EST" or line 2 from the "Amiternum/My Suite" stop to the "Viale Crispi" stop in the city center (see timetable).
Taxi cabs are typically available at Hotel My Suite, on the opposite side than the bus stop. Otherwise, you can call the radio-taxi company (phone: +39 0862 25165, web: www.radiotaxilaquila.it). Notice that for late night arrivals (from 00.30 to 7 am) you should book the taxi service in advance, by 7 pm.
If you are taking a bus operated by TUA, you should get off at Terminal bus Collemaggio, the final stop of the route. It is a 10-minute walk from GSSI and the city center, as shown on the map. If you have a heavy luggage you can consider taking "navetta centro" (free service) and drop off at the "Viale Crispi" bus stop.
A map showing the bus stop in Viale Crispi and the GSSI buildings is available here.