Stay here. Period. Perfect location, perfect apartment, perfect host.
The place is in a hip area walking distance to the Acropolis and all the important tourist sites. The apartment itself is huge. You can tell a lot of care went into choosing every detail. Corinna is wonderful and goes above and beyond for her guests. I can't promise she can continue this, but she left us a Greek cell phone, bread, butter, jam, and local booze that I forget the name of. She's super sweet and accommodating.
Just be aware that on weekends there will be street noise from revelers late into the night, but if you're out (or passed out) that won't be an issue.