Au Pair needed for french family

We are looking for a big sister for our 3 boys (3, 9 and 11).
You are patient, dynamic, able to take initiative, responsible.Non smoker is important.
You will have your own room and access to the internet.
Sometimes you will be traveling to France during school holidays.
Some light housework such as keeping kids room tidy, cooking time to time. Babysitting once in a while.
All evening and week ends free.
We live close to London. Close access to buses, underground.