I am watching it and it is bringing back BAD memories. Went through 5 in 3 years when dd was much younger.
1st brought boyf into house - lasted 3 days (Czech)
2nd was always out partying - lasted 3 weeks (Czech)
3rd was always out partying and went through 7 boyfs in 7 months - lasted 7 months (Polish)
4th was a JOY - great , loved my dd. I am still in touch with her . Has own children now in Bratislava. Lasted full period of 1 year
5th was a sulky cow , always depressed - lasted 3 months (Turkish)
1 out of 5 is not a good ratio really. Although I know there are some good au pairs but usually have different agenda than childcare.