I would recommend staying down-town and not close to the university because the trams stop at around 12pm from Sunday to Wednesday and 1am from Thursday to Saturday. You can take a tram in the morning to go to the university and another one to come back to the town centre after the conference.
Right in the town centre, small hotel so book it in advance.
Starting from 120€/night.
Address: 12 Rue du Temple 33000 Bordeaux
Right in the town centre, no refund possible even if you shorten you stay, book wisely!
Starting from 75€/night (+10€ for the breakfast).
Address: 6, rue de la Porte-Dijeaux
Reservation in English, Pictures
Starting from 110€/night (Breakfast included).
Address: 27 Rue Du Parlement St Catherine, 33000, Bordeaux Link
Right in the town centre, very small hotel so book it in advance.
Around 68€/night (+7€ for the breakfast)
Address: 66 rue Porte-Dijeaux 33000 Bordeaux
Not ideally located to easily reach the university, but still close to the town centre.
Around 56€/night (early booking can get the price down to 35€/night).
Address: 34 rue de Tauzia, 33800 Bordeaux
Not an ideal location, but still close to the town centre. You will have to walk to "Victoire" to catch a tram to the university. The hostel is also closing from 2AM to 5AM, so make sure to be there on time or spend the night partying for a little longer!
Price: 23€/night (Breakfast included)
Address: 22, Cours Barbey 33800 BORDEAUX