The French property market is one of the most stable in the world. Property buyers have an enormous amount of protection through careful regulation of both the real estate market and the banks.
A good example of this protection is when buying off-plan. All developers are required to pre-sell 50% of the value of the development, and then secure a bank guarantee which ensures that if a development is not completed, all funds will be reimbursed to the buyer.
Another advantage is the mortgage finance, which allows buyers to fix the interest rate for the full term of the mortgage (max 25 years). There is no need in France to remortgage every 5 years like in the UK.