Well, what a surprise! It only took 2 pages for the lecturing and "hire a hot one" posts to be made. The OP asked a legitimate question, yet has to read obnoxious posts. Way to go, APCers!
FWIW, I have no experience with au pairs, nannies, babysitters, etc., as I was a stay-at-home mom and had the good fortune to have relatives/friends babysit occasionally. Our family sacrified financially, but I wanted to raise my children. Other couples may not have that luxury, so give the guy a break, OK??