I got an incredibly good rate which made this reservation a no-brainer. One of my main requirements was a downtown Chicago hotel that had a spa in the hotel. The spa was clean and new with a good size workout facility, nice bathroom, steam room and relaxation lounge area for post workout or before getting a massage. The massage was very nice, good masseuse and new massage rooms. It is not the largest overall spa, but if going with a friend or two its a nice, modern facility and free to guests of the hotel.
The rooms were big, with comfortable beds and a new, large LCD TV but an odd lack dresser space, we had zero space to unpack our clothes. Good shower and a new bathroom round out a solid room and a comfortable stay. We were upgraded to a "lake view" room, which provided a decent view, but it was not really a full-on lake view, instead there is a large building across the way. This might bother some, not a big deal to us though.
I did not deal with the front desk much, but the concierge and people at the Spa were very friendly and helpful.
Finally, the location is great, 10 minute walk to Grant Park and the attractions around there and a 10 minute walk in the other direction to get to Michigan avenue.
There are MANY options in Chicago and certainly some luxury options that might be nicer, but especially if you can get a good rate, the Fairmont is a very fine option, providing modern, large rooms, helpful service, good location and a spa in the hotel.