Back on the main page, as well as visiting public spaces, you can visit guest rooms. On the Hotel Navigator, click on the 'Guest rooms' tab (1.). This will bring up a search screen listing the 11 most popular guest rooms open.
If there is a picture of a lock beside the room, you cannot enter it without the permission of the owner. Try clicking on a room without a lock. You'll see a new window containing information about the room (2.).
If it looks interesting, click on "Go >>" (3.), wait for it to load...and step into the room.