People tend to check in during these times:
Post your visa documents from the UPS store on 51st they deliver them next day at 1030am
Make sure you have dollar bills for the photo machine and don't let the annoying security guard click yes on your photos until you are happy! I look like frodo in my pics now!
The tip about it being one of the Queen's apartments is not true. Sorry.
One of THE QUEEN's Manhattan apts. Of course she's never actually in any of them, but still, very cool.