Pros:
-you get a free healthcare coverage.
-cost of life is reasonable (again, outside of big cities where accomodation is expensive).
-internet connection is good and cheap.
-you will enjoy a few benefits after some paper work. Ex.: the RSA, which is around 500€ you get with very little conditions (not having any revenue, being at least for 3 months in France, having a regular visa, etc.).
-you can legally start to earn money by being declared as auto-entrepreneur, with very little paper work (also with a regular working visa, and with some revenue cap).
Cons:
-language: better find some friend who can speak the language, especially when dealing with the administration.
-check carefully where you settle beforehand, France is one of the most crime-prone country in Europe (https://ec.europa.eu/eurostat/statistics-explained/index.php...).
To be honest, I would not recommend it because of the last point.