Sunnyjim I find it hard because no privacy. My au-pairs have always done housework as asked, and more, baked cakes, cared for and about ds - but this morning, for example, got up naked, as you do, and stroked cat and au-pair was around and just felt a minor sense of lack of privacy/irritation. I think if you have maybe a very big house, or a really pressing need for an au-pair, then it's different.
Last night I got so fed up about the whole thing that I saw down and worked out that dh and I between us, have 10 weeks' hols a year and by only having an au-pair for July and August we can get by the rest of the year just by each taking two weeks' hols a year separately. So I get my privacy rest of year and we cut down on cost and holidays no longer a problem.
Best solution all round.
I can't go on hols without her - she's too young, too sweet, knows no-one around here yet. Just wouldn't be fair.