My experience at Joseph's apartment was great ! I didn't have the chance to meet him in person but Lucia (the concierge) and her daughter warmly welcomed me.
The apartment itself is very tiny, but it's very well furnished and you can breath the typyical parisian atmosphere by living in it. The view from the 7th floor is breathtaking.
Last but not least, I would definitely recommend it because it's located in the most charming Paris district, the "Marais", a stone's throw from the main tourist attractions.
If I could, I’d move in right away :)