I travel to Monte Carlo every quarter at least (Gricham Jones's Chairman, Mark Haddad-Grisham, is a resident there).
Life seems a bit boring for "youngsters", but streets are clean, feel safe for a girl walking alone (unlike most large US cities, sorry to say).
I'ts not only the real estate: life is amazingly expensive: about $10 for a coke in any bar.
thx,
Sarah