I stayed here late November 2018, and had an amazing time! This hotel is incredibly well located - as others have mentioned, it's just across from the Notre Dame, but its also only a couple of minutes walk from a metro station and an overground station, so it's easy to get around.
I'm a single women traveller, and I always felt safe walking around the area and in the hotel itself.
The staff were lovely and friendly, and always there to help. The room itself was very 'petite' but clean and comfortable, with heating you can control yourself.
There are no tea/coffee facilities in the room or breakfast, which is a definite incentive to get up and go out in the morning to get your caffeine hit, rather than lounge around the room!
The walls are slightly thin so depending on how lightly you sleep, you may need to pack earplugs. I had no problems.
I would definitely stay here again next time I'm in Paris, far better than I expected for the cheap price!