Bus transfers between Pizzoli (where students' flats are located) and L'Aquila are operated by A.R.P.A. (recently aka TUA) Remember: tickets (around 1.80 EUR for a single one) must be purchased before getting on the bus and then stamped when you're on board. Most bars in Pizzoli sell tickets (you may see an A.R.P.A./TUA small poster on the bar window, which means that tickets are available there).
To get weekly or monthly bus passes (abbonamento in IT) you'll need an ARPA student's card. We'll provide you with such card (price is around 2.60 euros) a few days after your arrival. Before that, you can only get single tickets or weekly ones (more expensive).