About 10 years ago we took a trip to France, focusing on Brittany and the Dordogne region. Because of the size of and distance between the two regions, I think you need two weeks to visit both.
We stayed in a cottage in Brittany for one week. Then we drove to Sarlat, spending one night in Chinon on the way. There was an abbey I wanted to see near Chinon, which we visited on the way. The next day, we stopped at Oradour-sur-Glane on the way to Sarlat, where we stayed in a small house for a week.
We liked Sarlat as a base for the Dordogne because it has plenty of restaurants, as well as markets on Wednesday and Saturday. It’s very beautiful and we enjoyed strolling around the town after dinner. It was pretty easy to get to the various caves, as well as some of the smaller villages, which would also be nice places to stay.