We stayed 3 nights at Grand Hotel des Balcons, and we had a very pleasant stay. The room was big and comfortable. It was clean, and they cleaned the room daily. We also had a cute little balcony.
The location was perfect - only a short walk to get to cafes/restaurants, shops and Notre Dame.
The staff was very friendly and helped us order a taxi to the airport on our last day.
The only down side was that the room was noisy - the walls were very thin, so you could very clearly hear people in the hallway and when people went in and out of their rooms. This wasn't really an issue for us, but if you plan on sleeping late, it can get a bit too noisy.
All in all, we had a very good stay and I would recommend this hotel!