I'm trying to book a room in center city Philadelphia for Nov 2nd. All the hotels in center city state they are booked. However, I'm a platinum member and there is the 48 hour advance notice guarantee. I am getting very little help except people stating no luck. There are not caveats on the website about this guarantee except it does not apply to the Marriott vacation club. If it's this hard to use points, maybe my hotel loyalty is misplaced and I should begin buiding up points with a different chain.