A point which anyone applying for French Nationality should bear in mind ..... The ethos behind such an application is that one wants to become French! One must show, not only command of the language, but full integration, and embracing the French culture, as well as a knowledge of the structure of France. You will not gain nationality if your reasons are because UK is leaving the EU, or you like the lifestyle here. I was asked many questions to show I had integrated, like do I hold a French driving licence? where do I go on holiday ?(France of course), are my investments held in France? do I still have a "bolt-hole" in UK? how often do I go back to UK? Are my friends mainly Brits or French? Could I name some French ministers, could I pin-point various départements? and so on. Then a few months later, a convocation to attend the local gendarmerie where I was interviewed for about an hour and many of the questions were put to me again (and responses noted). Of course I was checked behind the scenes too, because a couple of my French friends received a visit. Well, I convinced them that my heart lay in France, and although I still have British nationality, that is incidental to me these days.
So unless you really do want to become French, and ulitmately take the oath of allegience, you really should ask yourself where your loyalties lie. If you are a true Francophile, no criminal record and can speak French, go for it, and good luck!