I live in France, and am often asked if I know of any English families who need au pairs, I always put them off because I don't really want to get involved/don't know the girls very well etc etc.
I've been asked now by the sister of DS1's best friend, and I'm happy to recommend her. She's amazing. Her English is almost perfect, but she'll happily teach LO's French too. She is only available June/July/August and beginning of September, and she would need accommodation.
If she sounds interesting to anyone or you would like to know more, please ask.