By Train:
To come to Vannes by train, there are several daily TGV connections with Paris, Nantes Rennes and Brest.
For any information: https://www.garesetconnexions.sncf/en/stations-services/vannes/hours
By Bus:
From the train station you can use the direct line 6 or a combinaison of the lines 4 and 1 but for all line go down to "Universite" stop.
For more information: https://plan.kiceo.fr/en/journey
By Car:
From Rennes you use the National road "RN24" to Ploërmel and change "RN166".
If you come from Brest or Nantes use "RN165".
For any information: https://www.viamichelin.fr/web/Cartes-plans/Carte_plan-Bretagne-France