We stayed here for 3 weeks in June, and loved it. It's a really good-size space, with high ceilings and lots of light. It's also very homey - doesnt feel like a rental - with lots of books and knick-knacks, and everything you need to cook, eat, etc. When we return to Paris, we will definitely try to stay here again.
The support staff was very helpful and responsive.
I dont understand some previous comments. For instance, the AC is very powerful. It was over 100 degrees one day, and the apartment stayed perfectly cool. The elevator is tiny - for 2 people or perhaps 3 - but it worked fine, except for one weekend. The apartment is indeed on the 7th floor, and the elevator only goes to the 6th - not a big deal.
The apartment itself is in decent shape. Everything works, the paint and cupboards are in good repair, windows open and close, etc. Some complained about the carpet in the bedrooms, but its perfectly fine. I'd rather call the flat pleasantly rough around the edges - you wont feel like you're staying in a museum. Beds and bedding were good. There's even a big closet to stow away your bags.
The neighborhood has more shops, cafes, restaurants, and supermarkets than you could visit in a month, and the metro station nearby gives easy access to the entire city.
One thing you must know about is street noise. Wow it's noisy! Even with the windows closed, it's pretty much a racket day and night. We sleep with a white noise machine anyway, which did the job so long as we kept the windows closed - and with good AC, that's always an option. But if you have trouble dealing with noise, this will be an issue. For us, it was no problem.
So in sum, this is a 5 star rental all the way.