My family member and I stayed at Arianes place for about three nights and we absolutely loved it. The apartment is beautiful and everyone living there is extremely nice. The room is cute, has a balcony with big windows that you can just swoop open in the mornings to get some early daylight in the room. Ariane made sure that we were able to use the apartment as our own, the kitchen, the living room and even the laundry machine were accessible. It felt like home and I did not feel uncomfortable one bit even though there (can be) multiple people in the house.
Regarding the location, absolutely top-notch. Beautiful sky-like park right across you, restaurants everywhere, Le Marais about 15 minute walk. We did not have to take the metro or bus anywhere (we are used to walking a lot, though). However if you do want to use it the station is not even a 5 min walk away. Supermarkets everywhere.
Long story short; I am coming back whenever I will be visiting Paris.