My daughter went to a home-based daycare, run by a married couple, around the corner from Bright Horizons on Mass Ave. It was quite expensive but one of the best developmental experiences of her life--and she went on to attend CRLS and Tufts. Obviously it's been a few years but they are still operating. They do not accept infants but you might keep them in your future plans--seriously, I can't recommend them too highly.