Transport to Massy is easier than to Montparnasse, and Massy is a calmer train station, but as mentioned before there are fewer trains to Nantes. The bus and RER options mentioned above to Massy, ad the Air France bus option to Montparnasse are the best options for transfers to Orly. Also, as mentioned above, Nantes is the only TGV station in the area. Generally your train will terminate in Nantes, giving you plenty of time to get off the train in Nantes. There is a tram station at Nantes Gare for easy connections to the university campuses: http://www.univ-nantes.fr/adminsite/...=1234198504442