I au paired in Switzerland for 3 months.
I'm not trying to put you off or anything, because this was just my experience, but I was treated quite badly. I worked every day, all day, with half a day off (maybe less) on friday. It was mentally and physically exhausting. Not only did I look after the 2 children (who were little monsters, bad parenting!) but I was expected to cook and clean most days too. I was paid little, and treated badly. When I asked to leave at the end of my contract, I was threatened and shouted at, because they hadn't found my replacement yet. In the end I left on bad terms, and that final month I was paid half my salary. I was basically cheap labour, and taken advantage of. It's not something I would personally ever do again.
As for Switzerland, I really recommend you look for work there! Despite the crappy family I worked for, the swiss are the nicest people I have ever met and I felt welcomed by everyone.