The apartment is located perfectly in Le Marais. It is a lovely apartment and well equipped. If you don't want to deal with the host rules of not sitting on most of their antique furniture I suggest you look elsewhere. If you can accept the rules then I would say that this is a great place, we found it quite restrictive.
The hosts are nice and they were very attentive. They met us at the apartment and gave us tips on the neighborhood, they were available when we had questions, which we are very thankful for.
Overall it was a good stay.