This is a beautifully furnished and decorated apartment very close to the Metro 1 line. My co-worker and I stayed there for ten days while working with an arts organization in the Parisian suburbs. We found Sylvie's space to be a wonderful home base that offered privacy for 2 people. It was very easy to get around via public transit, and I appreciated how communicative and thoughtful Sylvie was. She is detail-oriented and very welcoming.
The only small downsides were not about the apartment itself, but more that the area around it is in development right now, so there was some noise from construction. It's also a very old building so you do hear lots of creaks and sounds from the neighbors upstairs. All in all, the downsides are very minor, and I would highly recommend this place (light sleepers might just want to bring earplugs.)
It's nice to come home to a residential street after a day of exploring, and the apartment itself is lovely and cozy. I would highly recommend a trip (or ten!) to La Fournee d'Augustine, a bakery right around the corner with excellent bread and pastries.