Nanny Needed - Full-time / Part-time

We are looking for someone to pick up our daughters from school in Beacon Hill every weekday and watch them at our home in Charlestown until we come home in the evening. Fridays are a longer day because school is only half-day. We are looking for someone with whom our girls will enjoy spending time, and who can serve as a good role model. The girls are quite independent, so we don't need as much supervision and care as we need quality companionship. Someone who can help the girls with homework, but who also enjoys goofing around. A camp counselor mentality would be ideal. The girls will have homework, sports, and other activities that will require walking or driving.