Béatrice's studio is located in a cozy residential neighborhood in the 14th. It's especially practical if you're coming from Orly airport since there's a direct bus from Denfert-Rochereau, the metro/RER station that the studio is closest to.
The size of the studio is perhaps similar to an average hotel room in Paris, but it has most of the amenities you need. The bed, although a pull-out sofa, is surprisingly comfortable and I had no issues sleeping. Perhaps the only small issues would be the fact that because it's on the ground floor there isn't much natural light coming in and you hear a lot of footsteps from neighbors coming and going, but I think for short-term visitors you'll be staying out most of the day anyways so this shouldn't be a problem.
Within walkable distance are métros Montparnasse-Bienvenue (which has line 4,6 and 12) and Vavin(4). So it's an easy starting point to get around from.
The studio is also close to one of my favorite Thai restaurants in Paris, Prik Thai on Avenue du Maine!
Béatrice was super communicative and Fred who helped me with the checkin was friendly, too. I would stay here if you're coming alone or as a couple for a short-term visit to Paris