If you are not already aware, there have been massive general strikes in Paris (and all over France) as a result of pension reform. If you are going to France soon, particularly Paris, please stay up to date with all travel information. I am not sure how long strikes will continue - the last time something like this happened, the strikes continued for 3 weeks.
In particular, the metro right now in Paris is very unreliable with most lines not running or running very slowly. It's to the point where many universities have either cancelled exams or scheduled online exams because there