I can't think there is a better location to stay when visiting Paris. We had a great stay at Polo's apartment and loved our trip. Since we didn't need a ton of amenities it was perfect. All we really did was sleep there. I think we used the Metro once because it is in such a walkable location we could go anywhere in 15 or 20 min. Just over the river from Notre Dame and another 10 min. to St. Germain. Plus being in Le Marais was fantastic. Great vibe. Bars, shops, bistros etc. Xavier and Polo were incredibly responsive and very nice. One thing I would say is that we had to go buy our own toilet paper when the half roll ran out and there were no paper towels so we needed some of those as well. These are minor things but perhaps a few essentials could be added for visitors. There was a nespresso machine but no pods. A bag of ground coffee but no drip maker. a couple of tiny tweaks and it would have been perfect. but overall great!