We stayed here for 4 nights and had an overall good experience.
The staff is very friendly and helpful. Our room was small (16m2) but it had everything we needed. We were contacted prior to our stay about our room preferences (1 double bed vs two single beds or bathtub vs shower) and our preferences were taken into account. Even though our room was right next to the elevator, I was plesantly suprised that the room was very quiet. Hotel offers breakfast (additional cost) but we opted to have breakfast outside. At check-in, the staff apologizes for the quality of wifi - and it is true. But the bad signal quality is unfortunately everywhere in St.Malo, since the infrastructure for internet for the city is still being laid down. On the positive side, it would be a great holiday if you want to take a break from the internet :)
The hotel is very conveniently located in the city, we were super pleased with its location. Word to the wise, unless you arrive really early in the morning, be aware that arriving to the hotel with your car is very difficult, because the streets are full of restaurant tables and people. We directly parked our car outside of city walls upon arrival and walked to the hotel with our luggage (at 21:30). When we were leaving, it was 8:30 in the morning, and it was very easy to bring the car in front of the hotel and load our luggage.
Definitely recommend this hotel.