Pros:
Communication with the owners was great! They responded quickly and their directions for checking in were easy to follow.
The location of the apartment was great! Lots of restaurants nearby but it is on a quiet street. It took us about 10-15 minutes to walk to Sainte-Chapelle and about 20 mins or so to walk to the Louvre. We also walked to the Eiffel Tower which was a longer walk but definitely manageable. We did get a taxi back.
Our flight landed before check-in time, so Gemma & Lyron recommended using Nannybag to find a place to keep our luggage and there was a dry cleaner around the corner and we left our luggage there for a few hours and it was like 15 Euros per bag, flat fee. I would definitely recommend using the Nannybag app.
The apartment was clean, modern, and enough space for me and my husband. The pull-out couch was more comfortable than I was expecting. We only stayed for 4 days/3 nights and didn't spend much time in the apartment so I can't speak for the Kitchen appliances. I will note that there is a refrigerator but no freezer. Not a deal breaker for us but it's good to know.
Cons:
The apartment is up 4 flights of stairs, and the elevator does not work. We knew this when we booked the place but at the time thought it wouldn't be a big deal. After flying into Paris carrying around very heavy luggage in the summer heat, carrying it up 4 flights of steps was a lot worse than we had anticipated. The door to the apartment is on the 3rd floor but once you open the door, you must go up another narrow set of steps. If you're staying here with a lot of bags, be prepared to get a workout.
The apartment does not have air conditioning, which again, we knew this when we booked the place but didn't anticipate the summer being super hot! They did provide a floor fan but honestly it didn't do much. We kept the doors to the balcony open the entire time, but we felt the air coming in didn't give much relief. If you're going during the summer months, keep in mind that it could be very hot.
The bathroom was very nice but the shower door when shut, has a gap and water escaped easily out of that gap onto the floor. The bathmat was soaked every time we took a shower. I would actually try and ring it out in the shower in hopes to give it a chance to dry before our next shower.
In all, the place is nice, in a good location, and if you don't care about walking up 4 flights of stairs or lack of air conditioning, I would recommend staying here.