provided that you have made the reservation in accordance with the following conditions, then
Guaranteed Room Type
When making a reservation, be sure to note both your Marriott Rewards membership number and room/bed preferences. At locations throughout the U.S. and Canada, we'll always honor your bed type request. Outside U.S. and Canada, smoking/nonsmoking preferences are honored based on availability; exact bed sizes may vary. If guarantee is not met, guest compensation applies. [GOLD/PLATINUM]
https://www.marriott.com/rewards/mem...s/guarantee.mi