Sophia's apartment was as-described and VERY centrally located. During our stay, we walked to/from the Arc de Triomphe, Galleries Lafayette, Notre Dame (longer walks, but easy to do as part of sightseeing), and the Tuileries and Louvre are practically around the corner. The apartment is also 10 min or less from several subway lines, making it easy to take public transportation (e.g. you can get to Pigalle/Monmartre in 20 min). There are a lot of bakeries, cafes, restaurants, shops, and SHOPS nearby too. Sophia was responsive and proactive in communication.
Notes: To get to the apartment, you have to walk up 3 flights of stairs, which includes switchbacks - be mindful! Once you get to the floor, it is the only unit on that stairwell. The living room window is across from offices, and the bedroom faces the inner courtyard.