Hotel du Guesclin on Mont St. Michel

Don't know it but did you check on the reviews on trip advisor?

Yes, but none were current. One mentioned bed bugs.

We stayed there about 3 weeks ago, no bed bugs nice room , decent bathroom, over looking the bay. Limited service hours, breakfast is offered for add'l cost. And there is a restaurant on the second floor. Rooms are on the 2nd & 3 rd floor ( Using American floor numbers) if you need to leave early pay the day before.
In a nut shell, we would stay there again. As everyone except about 10 people commute to the island each day, it is interesting after the daily tours leave for the day.

Thank you very much. We will make our reservations at Hotel du Guesclin.

One of our best dinners at its upstairs dining room the evening we were there this April (in another hotel room). With a reservation you might get a table at the window, though views are fine farther back.