The private 17th century consecrated chapel is available to clients for religious ceremonies or for simple non-religious blessings.
In France one of the bridal couple needs to be resident for a period of 40 days in the commune where you want to get married before you can have a legal civil wedding.
Most foreign couples overcome this burden by having a civil wedding in a registrar's office in their home country and then coming to France with those civil wedding documents and then have the fairytale religious or humanist wedding of their dreams. This way they can have any officiant that they want and their guests do not need to know of their civil ceremony in their home town.
For more information please refer to your home country's embassy website.