You cannot ask for a more ideally situated apartment than this one. A few steps away from the RER B line which takes you to/from CDG airport and also next to the Saint-Michel metro stop on line 4. (it's near the RER C line too, but that station was closed during our visit due to repairs after the earlier flooding). Just a couple minutes walk to Notre Dame/Saint Chappelle/la Conciergerie and many other top tourist destinations within a reasonable walk. If you want a fresh crepe or gelato (or even falafel or a gyro), you just have to step outside the door.
The apartment is quaint and funky, and full of history yet with updated amenities. We had plenty of room for our family of 5 and appreciated the dishwasher and washer. There's no elevator so it was rough getting our heavy bags up the stairs but after that it was fine.
The owner's friend was there to meet us when we arrived and check in was a breeze.
We did have an issue with the internet the first 1.5 days but it was resolved after that. For being in such a busy pedestrian street, I expected a lot more noise but that's one advantage to being on the top floor.
Overall we had a great stay and were sad to leave.