Nearly all of my clients stay in Bayeux. It is ideally located for all the D-Day beaches and sectors and is on the main train line from Paris Saint Lazare to Cherbourg. It is also where I live myself, so is the easiest place for me to meet my groups. My sincere advice if you are not intending to have a car is to check carefully where you are staying. Some B&Bs that appear on travel websites listed as "Bayeux" are in fact miles out of town. The places I recommend in town are within walking distance or a short cab ride from the train station. By staying in Bayeux you will benefit from the many amenities and shops.
The Hotel d'Argouges - sitting just off the market square is a charming traditional hotel with wonderful staff.
Les Remparts B&B, is not only a great place to stay, but the owners are producers and sellers of excellent Cider and Calvados. The owners have been friends of mine for years.
The Hotel Tardif is another great place to stay right in the town centre, that is within an enclosed and beautiful garden.
left - Watch Rick Steves' show about Normandy. I showed Rick some of the DDay sites in 2016 and helped him with his book.