It is true that Marriott does not control what individual properties do (in general), but it is also true that Marriott should be willing to impose some baseline standards about notification and treatment under a cancellation on the part of the property (e.g. "No increase in cost to the consumer if reservation is to be moved, and a walk must be offered except under X circumstances" [e.g. no in-family property of a vaguely similar quality available within X distance]).