The apartment is truly unique and beautiful in a perfect location for exploring the Marais and surrounding neighborhoods. It's very close to public transit as well.
The apartment is listed through a rental company, and they do have you sign a separate rental agreement. This is not necessarily a negative, just something I think other guests should be aware of.
I have stayed in the Marais 3 years in a row, and although I loved the charm of this apartment (seriously, it's hundreds of years old and so cool!), there are spaces that I feel are a better value for the money paid.
Overall the space is beautiful and a great location.