We travel to Paris frequently and usually stay in the 4th and 8th Arrondissements. We chose Montparnasse (14th) because of the proximity to the la Gare, as we were coming from Rennes. By the way, the SNCF TGV from Rennes was a 2 hour bullet.
Monika was welcoming, quickly responsive in communication, friendly, and a great over-all host.
The neighborhood was diverse and ultra-convenient: fresh fruit and vegetable across the street, Monoprix 1/2 block up with laundromats, charcuteries, fromageries, patisseries, and store-made take out abounding along the street. One half a block down the street is a local brasserie, with decent food, and the Plaisance metro stop (Chatillon-Montrouge to Saint-Denis/Universite line13) and also buses.
The building security is tight: two locked doors to access lobby/elevator space. We felt very safe walking at night. The apartment seems recently remodeled. Though basically a studio, Monika has worked miracles with mirrors to create a spaciousness. The bathroom fixtures are new and stylish; the water pressure is great. The hair dryer has enough watts to actually dry long and/or thick hair. The kitchen "area" is modern, efficient, and stocked with enough equipment for a pleasant short stay. The TV is big and hanging from a nicely tiled wall. We're Amazon Prime members, so we had access to great additional programming. The room-dividing counter housed a clean and modern half refrigerator (no freezer) on one side and a washer/dryer on the other. We can't comment on it because we didn't use it and thus do not know whether it was one or the other or a combo.
We would rate Monika's place 5 star for host, neighborhood, and cost---for sure. There are only two caveats: the counter is not a bar so the two stools didn't slide under, and we wish the queen-sized sofa bed had more support. However, we are in our mid-sixties, well-traveled, and can be picky about things others aren't.
Definitely rent from Monika. Her place is clean, convenient, and she is a most convivial host. Nancy and Ted