One thing to note above all else: This is a *small* apartment. It definitely looks larger in photos, but it's two rooms — a small combined kitchen/eating area/single murphy bed in one room, and then a larger murphy bed in the other room (which essentially takes up the whole space when it's down) with a bathroom off the side of this second room. Unless you fold the beds up every night, there is essentially no space to lounge. And even if you did, it's still pretty cramped. This would work best for a couple staying together in the same bed, but it was a tight squeeze for two of us staying in separate beds.
That said, it was a lovely place to stay and call our home base during a weeklong visit to Paris! The location is great — it's close to so many wonderful shops, cafes and metro stations — and it was very quiet at night. You could sometimes hear upstairs neighbors, but it was never disruptive. One great thing is both beds were actually very comfortable! The pillows were a bit soft/flat, though, and there weren't any extra blankets/pillows for us to use.
As others have warned: it's a neighborhood and street with LOTS of hills and stairs to climb. For that reason, we didn't attempt to take the metro there with our luggage. That would have been a nightmare.
We were greeted by a very friendly man named Meziane, who allowed us to store our luggage while he cleaned the apartment. I only dealt with Stephane during the booking but had others help with questions about the apartment and check in/out. We checked in early and checked out late. Their flexibility and hospitality were excellent!
The bathroom was a good size and the shower had great water pressure. Plus it was nice having a heated towel rack! The only two complaints we had is that because of the shower design, water will inevitably flood the floor of the bathroom. They also only gave us 1 towel each. There is an area with additional towels/bedding that's off limits because it's meant for future guests, but we ended up having to use some additional towels in order to dry the floor after showers.
Overall this was a really wonderful place with great value. We would stay here again if we came back!