A couple of notes. You obviously have many options at the Atlanta airport. There’s the parking on site at the airport. There’s parking at hotels and businesses that you can reserve and there’s the offsite parking lots (of which there are a lot) and of course there’s the parking at MARTA and take the train.
One note the earlier poster says they park at the Chamblee Marta station. I would not recommend that - that lot is not for overnight parking. It is not secured at all and your car could be towed if you leave it there for two weeks while you go to Europe I have parked quite often at the Brookhaven lot which is secure and the person that works the lot is pretty close to all the cars because it’s not a big lot so that would be my choice. It’s five dollars a day - very reasonable.
Also MARTA after dark is not inherently dangerous if was getting in at eight or 9 o’clock. I wouldn’t have any hesitation to take Marta. I take it to and from work quite often - I’m still alive. Now if you’re arriving at midnight - It’s going be you and the homeless people on the train so you might want to pick another method.
The problem with the parking at the airport is that if you are going during a busy time travel time it can be full. They have opened this west lot to try to deal with that problem. Try if all possible to avoid the west lot. It looks good - it’s on the little train that goes to rental cars. But it uses their new technology that reads license plates No that’s not right - .it uses their new technology that doesn’t work so you will sit in line for about 45 minutes trying to get out while people struggle to get the system to let them out because it can’t read the license plate. And then, when you get to the gate, they will try to charge you extra because you didn’t exit in time after you paid. My response to the person on the other end of the talking box was not exactly polite. tried it twice I won’t be back - epic fail