While I did not have quite as many of problems you faced at the Westin Shanghai, I can confirm the AC problem. We were there in December with another couple, and both of our rooms were too warm to be comfortable. We had housekeeping open the windows so that the rooms could get cooler. It appears they turn off the AC and turn on the heat in winter, so those who find it too warm and want the AC on have no choice but to open the windows! Same problem at the otherwise excellent Spa -- treatment rooms too warm, they had to turn off the heat in that part of the hotel to cool the spa down!

The Crown Delux suites appear to come in at least two sizes. Ours was noticeably larger than our friends'.