I’d definitely recommend Sylvie’s flat. It’s lovely and it’s located in the vibrant and safe Saint-Germain. It’s walking distance from quite a few sights, the Louvre and Notre-Dame included. The flat was clean and there are quite a few bars nearby, but you are not bothered by them. Even though Sylvie could not meet me herself and despite the language barrier everything went smoothly in terms of checking in and out.