This was my 3rd time visiting Paris, so I've seen my share of apartments, and I have only good things to say about the experience staying at Antoine's place!
I travelled alone and stayed at the apartment for a week. I'd say it's great for a 1-2 person trip, regardless the length you're planning to stay for. The apartment is compact and very homey, providing great amenities like a working desk, a fully equipped kitchen, a large closet and even a speaker for playing music :)
The location was perfect for me, situated only ~5 minutes from the Metro station that will take you anywhere. The environment is really nice too, with a ton of bars and restaurants just a stones throw away. Furthermore, at night time it was really quite, allowing for a good night's sleep :)
The check-in experience was great, and even though I've arrived 1.5h later than anticipated (and past midnight!) Antoine insisted to stay and wait for me. The same goes for the check-out, which was easy and smooth.
I really recommend Antoine's place for any small party (1-2 person) looking for a well-situated cozy apartment to accommodate your trip to Paris.