Where to live in Atlanta GA for a summer internship?

All of those are pretty great places. Of all of them, Buckhead, Decatur, and Virginia Highlands are the most centrally located and safest, and places I would choose to live in. In all of them, you will have traffic. Lot's of traffic. With that being said, Buckhead and Decatur both have access to MARTA, which may not matter considering you will be driving. Virginia Highlands has no super close MARTA station, but is closer to down town and pretty much right on top of most of the major highways. At Virginia highlands, you will have noise, considering it is in the center of a huge shopping district. Decatur, while a really nice place to live, does have it's extremely seedy and dangerous parts, so if you get the chance to talk with residents while you're there, ask them if they have any trouble with crime overflow. Buckhead is were I grew up, so I can tell you first hand that it's nice, but you run a high risk of living near a huge jerk. Seriously, straight up jerks. Also, it will probably be kinda hard to find a $600-$800 rent in Buckhead, unless you strike a really good deal. Honestly, this might be true with all of them, as they're all either established neighborhood for the wealthy, or yuppy central meaning you'll be over charged.