I would say most Marriotts provide credits for incidentals charged to the room. Some of those will also provide a stay credit if incidentals are charged to the room. (HKG and PVG come to mind) there are few Marriotts that allow for lounge access when staying at the hotel when direct billed. I frequently use the PP when non-revving, Some require a seat assignment, some do not. dont really know until you show and show them your BP. I know that the AMEX lounge requires a seat assignment.