First, Vénie, the owner is a gracious, patient and kind host. She goes to great lengths to ensure travellers feel like guests in her home (which in fact they are). Her English speaking and writing skills are excellent so there should not be many issues for guests who primarily speak English and/or have limited French skills (such as myself). She is also very responsive and willing to assist guests with recommendations, reservations etc as much or indeed as little as desired.
This flat is well-located in the 7eme and literally around the corner from the Rue Cler district which has everything from dining to various take out options to markets and grocery stores depending on your peference.
From the flat, we walked to the Champs-Élysées, Eiffel Tower, and even the Musée d'Orsay & Louvre. If that seems too far, you can easily arrange a taxi, Uber or take public transportation.
As outlined in the description, this flat would not be good for people with any mobility issues whatsoever. The stairs to the bedroom are quite narrow and the loft requires using a ladder. The space I think is probably better suited for 2 adults and 1-2 children. We had to schedule our showers to ensure everyone had hot water for 3 adults.
As noted elsewhere, the main method of communication is the VRBO app or website, so I would strongly advise to add your service's travel plan while visiting. Of course this step will also aid with using your phone for information, directions, Ubers etc.