1. 48-hour Guaranteed Availability: Limited to Platinum Member's personal guestroom. Guaranteed room availability for reservations booked at least 48 hours prior to arrival available at all participating Marriott hotel brands except Marriott Vacation Club. 48-Hour Guaranteed Availability may not be available on certain limited dates (e.g., special events). Benefit cannot be used in conjunction with award usage or any type of promotional or discounted rates. For Residence Inn and TownePlace Suites, 48 Hour Guaranteed Availability applies to studio rooms only.