"In that sense, he and his unfortunate guest are evenly matched in the fact that neither of them did their homework - they both made ill-informed decisions, took unwise risks, and suffered the consequences."
I agree that is exactly the case here. Both host and guest equally bear responsibility for the access issue.
The host has apparently not been to his property in this season and circumstances, where a bumpy dirt road turns to thick mud, and it seems he wasn't made aware of that by his cleaners or whoever else deals with the property, which seems a bit odd to me.
And the guest definitely shouldn't have assumed she could access a property which says it requires a 4WD without checking as to exactly what that meant. A Prius doesn't have 4WD, it has AWD, which isn't the same thing at all. Nor does it have high clearance. All wheel drive improves traction on slippery wet streets, it isn't meant for getting yourself out of a mud pit. That's called off-roading, which isn't an activity you take your slick city car out on.
@Lauren2655