Louis' place is *great deal* in a stellar, central location. This is where you want to be when you visit Paris because its neighborhood is cool but it's also fast and easy to get anywhere else you'll want to go. There are many hip shops, restaurants, and wine bars within a 5-10 min walk from the flat. Check out Le Dénicheur!
The apartment itself has lots of room to work if you need while you're there, fast wi-fi, and a fairly comfortable bed. It's also spacious and sunny, which can be hard to find in Paris.
The one downside I experienced was loud construction noise from the building next door. It wasn't every morning, but it did wake me up earlier than I desired a couple days out of my four-day stay. That being said... Paris is under construction everywhere. So kind of take it as part of the deal.
I would absolutely stay here again. Highly recommend.