Not Marriott's usual high standards
I stayed in this hotel for a conference for 2 nights in Oct. 2012. It's a high-rise and one of the older hotels downtown. The location was great - right near the 16th Mall that has shops, food, and a lot of interesting crazies. Unfortunately, it wasn't a great hotel, and didn't meet my expectations as a frequent Marriott guest. 
Wifi is $14/night. Make sure you don't try to use it one time plugged in and another time wireless b/c you'll get in a big mess, have to talk to tech support, be told it will come off the bill, then checkout the next day and fight with the lady about it still being on the bill (even though I had a confirmation # from tech support). I mean, who doesn't offer free Wifi these days? There's no free breakfast, either.
The rooms were clean, good views, and everyone else had great customer service with the exception of one person. The gym was nice. But, for $250/night, it definitely was not worth that! I wouldn't stay here again. Go to the brand new Spring Hill Suites on Auraria that's maybe a mile away. I stayed there 4 nights after this place and what a world of difference!