Gary et Camille are the hosts you wish for when travelling - they replied quickly to our messages, leaving no space for anxiety to develop. :) Their place was tidy and funky - there's some crazy colours in the room when it comes to lights (you can opt out if you're not the kind, no worries), the bathtub was huge so there was no need to worry about splashing water everywhere during showers and the room was intimate. The only downside was that during the evenings you could hear a bit of music from the bar downstairs, but nothing too unbearable that cannot be solved with earplugs or simply being tired from walking around Paris.
In regards to the location, the place couldn't be situated better. Close to Marais and République, it is well connected and easy to get to. It's half an hour to almost everywhere you wanna go - from the Eiffel Tower to Champs-Élysées. We enjoyed our walks to Notre Dame - it was half an hour walk from Gary et Camille's place. There are also some good restaurants around - we loved Goku, where they have really great pad thai, shops and stores for buying souvenirs close-by, in Marais.
We would definitely choose this place again if we came back. :)