I've stayed at CY ST for quite a few times, including summer and winter. Fortunately I did not experience room temperature problems because the in-room air-con control was fully functional.
Smoking in public area is mostly influenced by people from mainland China. Quite annoying. So far, my rooms were smoke free (knock on wood).
Check in at the lounge is always offered as soon as I mentioned "platinum member" to the bell boy carrying my luggage.
Thanks for your detailed review. Many FTers will benefit from it. For those who are interested in seeing some pics of CY, go here, scroll midway down to post #24:
http://www.flyertalk.com/forum/trip-...-pixels-2.html