Seek 2-weeks French Intensive classes in summer (Paris)

Hi / Bonjour,

I am looking for good quality/price ratio intensive courses for this summer.
I live in Paris, I am looking for this for my sister coming in July or August. That is why I would like to get someone honest (not commercial) advice on a good 2-weeks French course for intermediate level; preferably in North of Paris (Rive Droite).
Many thanks in advance,