I think that this apartment is a great choice if you don't like hotels and really want to feel in Paris like you are at home. It will be perfect for one/two persons. The kitchen area is pretty small but it has everything that you need and even more.
I also liked the location of the place, as it's easy to access the city centre by metro or you can go for a walk to Bastille, Le Viaduc des Arts or Père Lachaise Cemetery.
I didn't have a chance to meet Charlotte in person, but she was very helpful and friendly online.
P.S.
However if you have big luggage keep in mind that you need to climb spiral staircase. Personally for me it wasn't an issue.