Efficient staff. Amenities not up to par.
I travel several times a year and have experienced a variety of hotels and resorts. When I stay at a top notch hotel, I appreciate those extras that make life away from home more pleasant: free Internet, clean swimming pool, mini frig, tub mats, storage room for clothes, bathroom fan, a hook for my toiletry bag, and a box of tissues, bedside. 
Sheraton Downtown Denver lacked those special touches.   On a positive note, the hotel location is excellent and close to the Denver Convention Center and a myriad of restaurants/shops. All are within a pleasant walk. The hotel staff are friendly and accommodating. The beds are comfortable and the rooms, average size. But lack of storage for clothes is ridiculous, especially if you have to share a room with another professional.   In room Internet will cost you $10 - $15 per day. There is free access in the lobby but who wants to hop on the elevator late at night and trudge to the lobby to check email? 
  I stayed in the Plaza building. I used the rooftop swimming pool which is located on the 5th floor of the Tower building. It was disappointing for an outdoor pool. Not very clean and minimal. There wasn't a hot tub and the women's changing/restroom lacked showers. Since the pool was in shade after 5 PM, it was quite chilly getting out. You either had to trudge to the elevator and through two buildings wet and cold, or change without a shower. 
I would check other downtown hotels before staying at the Sheraton. But if you are only there for a couple of nights, it will suffice.