As far as I know, all of the rooms are approximately the same size if you are talking about standard vs pool view vs dtd view etc. Some of them are a little larger than others but there is no way to guarantee size with those booking that I know of. It just depends on the layout of the room but the difference isn't much anyway. If you are asking about suites, there is a big difference in size. I have stayed in all the different view rooms and now I just book a standard unless a view is on sale or isn't much more expensive because it really is just the room view/ location that changes. You can request King vs two Queens which can make the room feel larger but they are never guaranteed either.