The Brown Palace is certainly beautiful and of historic importance. The hotel is grand in feel, with larger rooms than I'd expect for a hotel this age. However, great ambiance is not enough to compensate for physical disrepair and poor service.
I had a very poor experience due to problems with the room and, more alarmingly, minimal responsiveness from the staff. Specifically, the heater in my room was broken and clanged all night long. After tossing and turning for hours and trying (and failing) to turn it off myself, I finally gave up at 5 am and called the front desk, hoping for some peace and quite so I could get at some rest. They assured me that engineering could shut off my heater centrally, and told me they would do so ASAP. 30 minutes later, the heater is still clanging away and I'm no where closer to getting some sleep. I called again, was again assured that the heater was shut off, but that it "takes time." OK. And this went on. It took me almost 3 hours to get someone to physically come to my room to manually disable the heater. At this point, the sun was up and my first meeting of the day was just an hour and a half later - so much for shuteye!
I will say that the manager graciously refunded my room charge; however, I would have much preferred a good night's sleep. If you are a business traveler who wants good service and a comfortable stay, don't look to the Brown Palace.