Finding the right host-family can be a little tricky but is perhaps the most important thing if you want to enjoy your time as an au pair. Even if it seems like the family is ideal at first you should definitely spend time in sorting out where your priorities lie and if they meet with theirs. I had to learn that the hard way.
When you get in touch with host-families the key is to ask the right questions and not to be shy to ask anything you want to know. Before you do that however you should think about the things that are important to you as well! Write down all your questions and also their answers so that you can always refer to that if you need it!
This is a list of questions I asked (and wish I had asked!) when talking to my family the first time. Maybe it will help you and be something like a guideline for your interview.
However the most important thing is to just be yourself and don’t answer anything not truthfully because you want to impress the family! Don’t be scared those interviews are just to get to know each other nothing is settled yet! And always remember: It’s not just you who talks to strangers, the family doesn’t know you yet as well and they are probably just as excited as you are!