TL;DR: Awesome large and well-appointed apartment, amazing views, spectacular location. You should stay here!
Our family (my wife and I, and our 3 kids -- ages 6 and under) really enjoyed staying in Aurélien's apartment. The location is amazing - it's very centrally located, right on the edge of the 1e arrondissement in Paris, and in the middle of a bustling tourist and restaurant district.
The apartment is a very short walk away (2 blocks) from le Forum des Halles, a popular new large multi-storey shopping centre with many well-known shops. There are at least 3 small-to-large grocery stores (Monoprix, Franprix, etc.) within a 2-block radius, so finding some groceries and necessities right after arriving was painless, even late on a Saturday night.
We found the area around the apartment very family-friendly -- even at later at night. The entire area around the building is almost completely made up of restaurants, cafés, and bars.
Getting around was also very easy. There are at least two Métro stops within a 2-block walk of the building, but since it's so central, walking to many attractions was preferable to us (e.g. Notre-Dame cathedral was a 20 minute walk away, and the Opéra and the big department stores on Boulevard Haussmann were about the same length walk in the opposite direction.) The Eiffel Tower was a little further away -- about an hour walk -- but grabbing an Uber or a taxi was a cheap and easy alternative.
The city is also littered with electric scooters (literally littered), so if you have older kids, that's a great (and fun) way to get around for relatively cheap.
As to the apartment itself, it was awesome. It's a penthouse suite on the 7th storey of a beautiful building. The rooftop views were spectacular, especially on sunny days, and there are 5 large windows that fully open and have blackout metal shutters. The master bedroom is well-appointed, with a large HDR TV and sound bar setup, and the larger tub/shower in the ensuite. The second shower (+ clothes washer/laundry room) is shared by both of the other bedrooms -- one is clearly a kid's room with a bunk bed/desk combo that my 6-year-old son was very happy to stay in. The other guest room has a double bed that looks like it folds back into a futon/couch. Our twins slept here and the quiet + darkness (from the window shades) was a great combo to get two rambunctious 4-year-olds to sleep well at night.
The living areas are large and bright -- Aurélien has done an amazing job hooking up a very cool lighting system of various Edison bulbs in his living/dining room that can also control the outside window lighting. It took me a minute to figure out the controls (he uses a DiO 1.0 system that I hadn't seen in North America), but once I got the hang of it, we used it every evening. His home theatre system is also fantastic and our kids got good use out of the provided Netflix app.
As far as amenities go, we made use of both the dishwasher and laundry (washer). There are also heated drying racks in both bathrooms. The kitchen has a very large fridge, freezer, dishwasher, stove top, and oven, as well as a Nespresso Vertuo machine. Finding coffee pods for the machine was difficult (you have to go to a Nespresso store to buy them, unfortunately), but Aurélien kindly let us use some of his pods. Pretty much everything we needed in terms of bare necessities was already in the apartment, so we didn't have to buy much when we arrived.
I think the only downside to the apartment was the single toilet in a rather small, dark room. We were aware that separate toilets are a common thing in France, but we didn't realize from the listing description that there was only one toilet in the apartment. We chalked this up to a misunderstanding of the difference between "salle de bain" (bathroom) and "toilette" (wc/toilet) in French, and we still ended up managing with 5 people just fine.
Communications with the owner and his "helpers" was also great. Steven and Anne-Laure were available via text/Whatapp on short notice, and Aurélien (who was on vacation himself) was very responsive via Airbnb messages. We kept communications to a minimum but everyone was very helpful and got back to us quickly with answers to any questions we had.
Apologies for the long-winded read, but I figured someone might appreciate a bit of a deep dive on the apartment and local area, as I would have reading reviews. We would highly recommend this apartment to anyone staying in Paris looking for a low-maintenance way of seeing the sights, eating at a massive variety of restaurants, and shopping. Thanks again to Aurélien and his team, we'll definitely come back to stay here again!