This location is the best! Lourve is a 9 minute walk, Notre Dame is about 15 minutes on foot, the Seine is about 5 minutes or less. This was the perfect location for us. The area felt safe and pretty quiet. There is a small market a short walk away. Things to be aware of: it is up a slightly narrow staircase, you can look into the cute courtyard but you can't actually use it, the windows have room darkening shades which were very nice to get sleeping on schedule, you won't have washcloths(bring them if it bothers you none of my European rentals or hotel rooms had them),no paper towels, napkins, or tissues all not important but nice to know ahead of time.
We had a few travel delays so we didn't meet our host and get any directions but I just messaged him and got a very speedy response. I could not work the pull out couch and didn't want to force it and break it (maybe sleep deprivation played into this) but the couch back pulls down and rolls from that. The pull out couch is very squeaky but that is likely not something controllable just annoying but it was comfortable. I did have to watch a YouTube video to figure out the washer, it takes a LONG time for this type of machine to wash and dry. You can control the room temperature which is very important. I was hot when the local citizens were in jackets.
I would definitely recommend this apartment. You will not be disappointed.