Live in part time au-pair

Live in au-pair in central Paris. 3 nights a week from 3-7:30 with occasional extra hours/babysitting. A french boy and girl aged 5&7 looking for someone to speak in only English with them whilst caring for them (taking to activities/bath/cooking). In return there is a chambre de bonne in the same building in the 7th right next to champ de mars.