I only asked at check-in because I didn't even realize they had them! When I was standing in line to check-in, I was reading some of their literature and saw the kidsuite info.
I had a very friendly check-in girl, so I just asked if there was any possible way to get the kidsuite (I expected her to quote me a figure to upgrade....yes, this was a priceline bid)
That's when she checked the puter and simply said, sure, but it wouldn't be ready until later in the day.
As I mentioned, we were there for only the one night and we were eager to get settled in so I just opted for a room that was ready.
Good luck, hope it goes well for you