We had a wonderful month-long stay at Natalie's! Natalie met us on our first day and showed us the ropes, which was much appreciated. The apartment was very cute, spacious, and the loft was a lot of fun to sleep in. The location of the apartment was also great. Very close to lots of cafes, shops, two different metro stops, and within walking distance to tons of sites: Notre Dame, Louvre, Tuileries, etc. An added bonus is that her cat will come by and hang out with you for a bit if you leave the balcony door open. Sweet kitty!
The one downside is that the neighbors (not sure if next door, above, or below) can be very loud. We've experienced countless nights with hearing music blasting and people being loud up until around 2am.
Overall, we loved our stay! I would definitely recommend this apartment to anyone visiting Paris.