Nicolas and his place are by far the best experience my boyfriend and I have ever had with Airbnb. His cosy, beautiful and well designed place is located on the top floor of a lovely apartment in a quiet neighborhood. If you open a skylight and windows, nice breeze goes through the place. Everything we needed was there for the week stay; Nicolas even provided us with extra amenities!
Once you are out on the street, there's a great bakery 2 doors down, crepe shop and supermarket down the street, laundry service on the same street, and so on. The closest train station Lamarck is few minutes walk around the corner and Moulin Rouge is only a 10min walk away if you are looking for touristy thing to do.
The metro in Paris is very elaborate and you'll be able to get into the heart of the town via Lamarck station in no time. Nicolas gave us a list of places to dine and drink, as well as personally picked suggestion of things to do while we were in town. They were awesome suggestions. We enjoyed visiting the recommended museums and restaurants, so don't miss out :)
Only warning is that, like many places in Europe, his place is located on the top floor of the apartment and you have to use stairs to get there. We had large luggages and was a work to get it up, but Nicolas kindly helped up the heaviest suitcase we brought (on one of the hottest days of Paris). So if stairs aren't your friend, I suggest contacting host first for the accessibility and any issues you may think you might have.
We would definitely be back to stay at his place if we are in Paris, and recommend the apartment for our friends and families.