How to come to Rennes
Rennes is directly reachable from Paris -Station Montparnasse- by high-speed train (TGV; 2h-2h30). Then from the train station, take the underground direction J.F.Kennedy, get off at République.
How to come to Agrocampus Ouest - centre de Rennes
From République, borrow:
• or the bus n°C4, direction Beauregard. Get off at the Marboeuf stop and walk up the Rue de Saint-Brieuc. The 65 is on the left hand side of the street at 400 m.
• either bus n°53, direction Vezin, L'Hermitage and La Chapelle Thouarault. Get off at the Rennes - Agrocampus stop.
To find out more about bus schedules, itineraries and prices, see here or here.