We stayed here a couple of nights on the way down into La Rochelle. La Tranche is a great little resort, rather touristy but a has everything you need. Les Dunes is just across the road from the beach but bear in mind you have to cross a busy road and walk through the car park.
Our stay was a positive one, my only gripe was with the room, it was at the back and rather small, OK for a couple of nights though and lovely and cool. Bear in mind if you have a sea-facing room you will get the full heat of the sun for most of the day but they have shutters which are essential.
The restaurant was good, especially for sea food lovers and the staff were all friendly and approachable.
