I don't know whether the focus of French is grammar or spoken English or something.
The most authoritative one is the French Union of Nanshan Expert Building of Nanjing Normal University, which is an international French culture teaching organization led by the French government. Most of the classes in various forms are taught by foreign teachers, and so is grammar without teacher China. There is a library in Suiyuan Building with a lot of French materials.
Other places may generally pay attention to grammar and TEF (French assessment and examination abroad), but I suggest you go to Nanjing Falian, next to the Suijiacang Station of the Suiyuan Headquarters of Nanjing Normal University. You can see the signature atmosphere on the top floor. This is the best way to learn French.