International schools in warsaw

Hi. I am new to the Expat.com and this is my first topic. We are considering moving back to poland in July 2016. I am polish but I haven't lived in poland for 20 years and never in Warsaw anyway. My husband in English and our child was never educated in the polish school; even though she speaks perfect polish too.
I am looking at two schools in Warsaw before deciding on house/ flat location. French school or American school in Konstancin. I will be extremely grateful for your help and feedback regarding those two schools: academics; ambiance; achievements.
Thank you again
B

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