I don't see why people are so against this, most people pay little more for their own live in Nanny, cleaner, general gofor, the fact she will get the chance to travel is a bonus, and especially to someone who has never been in a position to travel and probably never will without this offer. Hell, with a little genius behind her she could even exploit the situation to her massive benefit if she can network well at these business parties and dinners etc.
I agree the money is low and he will probably have to up that, and the right candidate will probably negotiate that up to around double anyway.
And what is peoples idea of Campo? Campo is living in the country, it doesn't state a specific class group, the nicest houses in the country are in the Campo, we live in Campo, I am baffled by people referral to this as a definition of class, it isn't.
I am not saying this is a good offer by any means, I am saying with the correct incentives and security cover for the candidate it could be a nice 'out' of a situation they might just need. The OP knows what he can expect when he is offering less than reasonable salary, so I doubt he expects an all singing all dancing super nanny.