I was in Atlanta for a youth gathering this past summer. The gathering hosted 45,000 people (mostly high school age youth) over two weeks (22-23,000 oer week). I learned that their MARTA system (metro, subway, underground train, whatever you want to call it) is pretty good and has two stops at the dome and you can get pretty close to anywhere in the city via this system.
I spent most of my time at that hotel because we made some new friends who were staying there (it is a very sweet hotel...it has the largest atrium in the world). However, we weren't staying there. My youth group stayed about 5 MARTA stops north of the Marriott Marquis (I have no clue how far it was without relating it to the marta, cause that is how we got there) at the Hampton Inn. I believe my room had one of the most beautiful views of the city, only bested by another room our group had. I will try to upload th pics of the views when I get a chance.