I stayed at Iris' flat for 9 nights for my first time in Paris, and it couldn't have been more perfect. It was close to everything pretty much; I was able to walk to Notre Dame and the Louvre all within 20 min. There's also a metro just around the corner, and a grocery store, and bakery, all along the same street. Definitely be prepared to have to walk up and down a few flights of stairs, but this seems to be pretty much standard in Paris and I thought it only added to the charm. The flat itself was clean and tidy, with a lot of little details placed here and there that made it very homey. Communication with Iris was also great, even though she was on holiday at the time. There's also a major station just a 10 min walk away which was perfect for me on my last day in Paris as I was able to take the train there straight to the airport. I only wish I could've met the cat as I read she's pretty great, but she wasn't there throughout my stay.