I have only positive things to say, and having stayed in many Airbnb's around the world, would rate this experience among the best. The room/balcony/bathroom are private and well-located away from the host's sleeping quarters (upstairs), and look just like in the photos. The bed is comfortable and the shower warm with strong pressure. All is very clean and towels and toiletries and hairdryer/styling tools are provided. The rest of the apartment is modern and well-decorated. The location is perfect and private/quiet hidden in a courtyard away from the street. As others have described, the entrance is steps away from the metro (1, 8) that can get you anywhere in Paris. Carolina and Horacio are also very kind and speak French, Spanish and English with ease, as well as being interesting people. I would highly recommend a stay with them.
Ps give yourself some extra time with the apt. door key, which takes some mastery to open with ease.