How to go to University from the center of Rennes:
From the center, take bus #4, 6, 40Ex or 41Ex from «République» or «Pasteur», to «Tournebride». see the Bus Map Bus Tickets : buy them from the bus driver, or at a "bureau de tabac" store; there is one at the railway station (bus 41Ex departs from the station at certain times). There are also handy automatic ticket machines in every métro station (eg. République, Gares, etc.)
- Rennes Saint-Jacques Airport. If you are lucky enough to find a flight there, it is very convenient.