Atlanta Housing Recommendations from Current Students

Georgia Tech Graduate Housing Brochure.

Article About Off-Campus Neighborhoods.

Off-Campus Housing Directory.

Other popular options very close to campus:
University House Midtown
Square on Fifth

Popular options that are a bit farther away:
Berkeley Heights
Collier Ridge

You may also want to look at Georgia Tech's Reddit page (though please keep in mind that people on Reddit can be opinionated without much information).