Do yourself a favor - look elsewhere
I am a big Starwood/Sheraton fan, and try to stay at Starwood properties - generally Sheratons when I have the opportunity. This is the worst I have ever stayed at. 
When I arrived for check in - the line was almost out the door. There is no line control, no stanchions, staff member managing the line, etc. People start waiting online a good 10-20 feet from the registration desk at a pillar. Thus, the line will quickly snake around to avoid going out the door and feels and looks chaotic. In addition, while there is a sign over one area that notes it's for Starwood Preferred and Platinum members - since it is not stanchioned or set apart in any way - it would be a brash or highly entitled member who braves the wrath of a crowded line to go to that section.
The young woman who checked me in was borderline rude - even though I am a Platinum member and was listed as a VIP for the conference I was attending. Though my group had arranged for an early check in - my room wasn't ready and she basically told me it was my fault for arriving so early - though I had a meeting I had to attend. In addition, I was confirmed on the Club Level - but she did not offer the key to the Club Lounge so I could at least have a place to wait and work until my room was ready - and when I asked for such access she seemed regretful to let me have the key for it.
Once my room was finally ready - it was abysmally dirty. The surfaces of the furniture - particularly the bedside table had not been well cleaned and bore the residue of previous guests' glasses and other sticky messes. The furniture was chipped and outdated, the bathroom teeny and awkward, the carpet was dirty and stained, and the room felt dark and dingy despite floor to ceiling windows. During the four day stay - housekeeping did a minimal job. The coffee cups and stirrers were not replaced, dirty drinking cups were not removed or replaced, and the services never were wiped down.
It took 5 calls to the help desk to get the wireless internet working - and even then it was sporadic over the four day stay. I never received the daily newspaper I was entitled to as a club level guest.
The final straw, and the reason for this review, my first ever, is that the morning after check out I realized I had left something of value in the room. When I called security the lack of concern and follow through on trying to help me recover the property was terrible. Despite promises to follow up with phone calls, I was the one who had to keep calling, and I am seriously doubting that there is any urgency or care to helping me recover my property.
There are lots of other lovely, convenient hotels in the downtown Denver area - do yourself a favor and stay there if you can.