The Glenn
I just returned from a weekend trip to Atlanta, where my family stayed at The Glenn. It's a great location, especially if you have an event at the Georgia Dome, the Georgia World Congress Center, or Phillips Arena.
While small, we found the rooms to be quite comfortable, and the staff was great. The property lacks a Concierge Lounge, but do offer breakfast in the dining room for Platinum guests. There is a limited, special menu for Platinum guests, but the prices in the restaurant are quite good. Adding a waffle, for example, is $5.
We have normally stayed at the Marriott Marquis, but the Glenn offers a great experience.