I had a great time in Paris, thanks in large part to this great place.
I wanted to check in early, and Stéphane was so very helpful in making this possible.
Location is excellent: I was attending a conference at the Palais des Congrès, and the building is right across the road/s from it, so I could leave about 6 mins before a session. It's also right next to the Porte Maillot metro step, which is on the #1 line, so you can shoot right into the more touristy areas of Paris with ease (or out to La Defènse if you wish). The Sablonville area right around it is full of nice little restaurants and stores (I'd recommend Rue Madeleine Michelis, since it has a nice wine store, a fromagerie, a boulangerie, etc.). And though CdG Ave is noisy, it's up on the 7th floor and the bedrooms aren't on the road. I felt safe in this area too.
The apartment itself is lovely. Lots of light -- windows and skylights all around, which when opened also allow for some excellent breezes. Living room is sizable: the pics might make you wonder if it's just a lens making it look big, but I found in larger than the pics suggested. Nice big sofa. Kitchen had everything I needed (I ate all breakfasts, one lunch, and one dinner at "home" and had everything I needed to prepare food). Bedrooms nice and beds cozy (note you need to go through one to get to the other), with good fans in the rooms. Nice hot water at an instant, with good water pressure, in the shower. Big television, if you somehow came to Paris to watch TV. My roommate enjoyed having a washer-dryer to use. Can see Eiffel Tower from window.
Stéphane was super-responsive, too. Any question had an immediate response. As said above, he went out of his way to help me check in early.
A lot of my friends stayed at the Hyatt Regency, paid the same as I did roughly, and got nowhere near the deal, amenities, or experience. I'd highly recommend this place. Indeed, I'll definitely aim to stay here again next time I'm in Paris, even if it's not at a conference, since that #1 line moves and the surrounding area is so lovely.