What is the best way to choose a good nanny agency. I live in NY. Do you use the old companies-the ones that's been here for years like "A choice Nanny." Or do you go to what looks like a new one that's ran by a former Nanny- Tiny Treasures NYC or do you just sign up for all of them. I just want someone who will look out for my best interest. Would love any advice you guys have.