1

Get the superstrada Firenze-Siena (if you arrive from the highway, get out at Firenze Certosa and turn right to take the superstrada)

2

Keep driving for about 60km until you see the exit Siena Sud (there are four exit belonging to Siena: Siena-Nord, Siena-Acqua-Calda, Siena-Ovest, Siena-Sud; Siena -Sud is the last one)

3

Turn right, and get out of the superstrada

4

After a few hundred meters you see a stop sign. Turn left.

5

After maybe 100m, turn right towards il Campo (don't go to 'il Campo', keep going...)

6

Turn left at the traffic light

7

Get inside the door (Porta Romana)

8

Turn left (you should make a U-turn around the traffic sign)

9

... and get inside the university

10

Here you are!