Asking about hotel poker room rates is really asking the wrong question. This implies you’re going to stay in a casino/hotel that has a poker room. The sad fact is that the 'poker room rates' are rarely very good. If you’re a whale in the pit, then yes, you can get extremely cheap, even free, rooms. But poker players don’t generate enough revenue for the casino to justify big discounts. They’re really hoping to lure you over to the pit, where they win your money directly, rather than just a few dollars at a time in rake.
So the real question is, “Where should I stay in Las Vegas if I’m playing poker?”