All that being said, most of the crime is home and car burglaries, not crimes against people. If the home is well protected and you aren't driving a car prone to theft.... you may not have an issue. there have been a few late night person-to-person robberies so always keep your eyes open and travel in groups in the wee hours if you can.
IT depends on what you are comfortable with. Burglar bars are meant to keep thieves out. If you are comfortable with it, there is no problem. You may want to explore your options though because Atlanta has a lot to offer as far as beautiful properties that don't have a restricted view with burglar bars. See what else is out there before you commit just because its close to downtown.
Are you talking about renting an entire home for yourself? Have you thought of renting just a room in a house with a family? That way, you wouldn't be alone and would have that family as protection.
These links should be able to provide some of the answers you are seeking.