Sylvie's place was absolutely lovely and exactly as shown in the photos! Bright, clean and well decorated, we couldn't have asked for anything more. The floor to ceiling windows/balcony was fantastic to have as well. In terms of location, it's most convenient to get to Le Marais and Montmartre, and an easy ride to Saint Germain, but just keep in mind you will have to take a train for a bit westward for Eiffel Tower/Arc de Triomphe.
It was nice to meet Sylvie as well and not only was she very responsive, she also proactively checked in on how we were doing!