What are the differences between the rooms? Grand King, Riverview King (kind of obvious there), Club King & Club Deluxe King. What are the differences, generally speaking?

It looks as though the Grand, Riverview & Club rooms are all the same size, but the Club King room is on a "private concierge floor". Pardon my ignorance, but what does that mean?

The Club Deluxe room is 25% larger & on the private concierge floor, as well.

Anyone stayed at this hotel? What did you think of the rooms & which rooms would you pick?