"my husband is guitar mad"
Not as mad as me, I have 7!
Oh and if you do hire that guitar, take a set of strings.
Personally you would be better buying a cheap chinese acoustic guitar (used) here and sell it when you get back from your holiday, you would probably not lose much money on the deal. Because there isn't much luggage change on these tourist charters, a gig bagged guitar with the guitar wrapped in bubble wrap should be OK in the hold and not too heavy. I've travelled UK with gig-bagged guitars in the hold (allbeit bolt on neck Fenders copies) I WOULD NOT do this with any guitar of great value, ABS cases are cheap these days. Cheap acoustic guitar wrapped should survive, make sure loads of FRAGILE stickers.