Just wanted to report back here on how things turned out, in case anyone else runs into a similar situation in the future.. Yesterday, I called The MR Plat customer service number to ask about the room type / bed type guarantee and how it applied to my situation. I told them I wanted to know prior to going into the conversation with the local hotel management whether the corporate office would back me up in my assertion that the guarantee had not been met because the only King room (what I reserved) available had no climate control, thus forcing me to move to a different room type. The CS rep wasn't sure and said she need to ask "higher ups". She came back after a long hold and told me that the guarantee would not apply because the hotel had initially put me in a king room. For clarification, I asked her "so as long as the room they initially put me in had a king bed in it, it doesn't matter whether there was climate control, running water, or any of the other things described in the details for the room type I selected?" and she said that was correct. I told her that made the Plat room type guarantee a pretty hollow benefit, especially if the hotel happened to know a room was not functional aside from having the right size bed. She just reiterated that the only thing the guarantee covered was the bed type.

When I checked out of the hotel this morning, I figured I'd bring up the issue anyway - nothing to lose, and having been in a different bed type room my whole stay, I still felt the spirit of the guarantee had not been met. The front desk person checking me out seemed a bit clueless about the Plat guarantee benefit - she said she'd make a note of it and the $50 would be credited to me. I told her my understanding was that claims for this benefit had to be settled before checkout, and that the few times I had needed to use it before, the hotel had just given me cash on the spot. She called over the manager on duty. I explained that I had reserved a King room but no functioning King rooms were available on the night I checked in, so I wanted to invoke my $50 benefit. She reacted positively and without hesitation, asking me "would you like the $50 cash, or would you like me to credit you with bonus points?" I asked how many points, and she said she could give me 15,000. I said that was really generous of her and I'd gladly accept the points. She said "we want to keep our lifetime platinums happy, and I'm really sorry we didn't have a king room for you". At my request, she gave me her business card and wrote the point amount on it in case there was any question about it later.

So, bottom line, this hotel (the CY in Tempe, AZ) has definitely earned my loyalty for return visits with outstanding customer service. The MR corporate office not so much.