The university of Social Sciences and also the University Paul Sabatier, where IRIT is, have university residences. They cost 75F per night (12 Euros). Availability depends on the date. June and July are the best periods to get a large number of rooms. Sheets, towels and blankets are usually provided and are included in the room fare. Breakfast can, in principle, be taken near the residence. Showers and toilets are shared, as it is usually the case.
Note that there are many cheap and clean hotels in the vincinity, starting from about 150F (25 Euros), + breakfast (30F) where blocks of rooms can also be reserved. Student residence reservations will be managed by us, a priori.