I've never signed or imposed a lease agreement, either through an agency or direct with an owner. I've been a joint-owner, and loaned our place, but never formally rented it. I've also rented for many years, both before and after owning, and continue to do so.

This is the Lessor's lease, not VRBO's, correct? Have the lease agreement reviewed by an attorney, because I'm not one and my opinions, stated here, aren't worth a thing.

Is the agreement in French or English? Even though the laws and legal systems aren't the same, an attorney may see red flags. If it only protects the Lessor, is only in French and you don't understand it, or if it has onerous penalties, then if it were me, I would walk away.