Great location, walking distance to many points of interest like Notre Dame, Pantheon etc. Range of good food within walking distance as well. Place is in a quiet and quaint alley which adds to the charm. Being an old building also means you get to experience how living in real, historical Paris is like. Clear instructions on how to collect the key, so no issue getting into room although we arrived late.
Key issue for me was that the shower area has low beams (I'm 1.84m), which meant I have to shower half squatting or with head bent. if you're less than 1.6m, likely to be less of an issue. That can't be changed.
I think the place can be cleaned better too. The coffee machine had dust and stain on top. There were 3 pieces of clothings on the rack, and a pair of red wings on the water heater. At the clothes area, there were unused pillows, all of which made the place felt cluttered and work in progress. Have given feedback and hope that will be sorted out by owner.
And also, allow some time when checking out because it's expected that you pull out the bed linen, wash the cups and clear your own trash.