As a Gold I have been to the Marriott Singapore on award stay not on a priceline stay and I have stayed at several Marriott properties booked via priceline. My experiences are:
- Marriott in Singapore is great: Nice rooms, well equiped Exec Lounge (decent food in the evening and good drink selection) and huge breakfast buffet in the morning (we had the choice to take breakfast in the lounge or in the restaurant)
- Marriott values your Gold card on priceline stays. I always received free breakfast, lounge access (where available) and a nice room (even suite upgrades)
Enjoy your stay!