At the intersection of the North-South axis which connects Royan to La Rochelle and the East-West axis which connects Saintes to the Island of Oléron, at a place called Cadeuil, take the direction of Royan.
At the 1st roundabout, follow the direction of Le Gua then 100 meters turn right to take rue de la Croix de Chalons.
The Logis de Chalons is 700 meters on your left at 63.