Fenia's apartment was exactly as it appears in the pictures. It is a large, very roomy apartment with all the conveniences. It is clean, with comfortable, modern furniture, great wi-fi, and good AC. The kitchen is fully equipped, and the washer/dryer came in very handy. (It was a very welcome change, after staying in some very cramped, multi-level apartments on some of the Greek islands -- this aparment has plenty of breathing room!)
The building is in a convenient location, close to supermarket and with a pedestrian street right around the corner offering plenty of restaurants and shops. It's in an upscale shopping area, and very close to Syntagma square, where there are all the shops and restaurants you could possibly want!
Fenia was a great host, very responsive, and a kind person.
I would highly recommend staying in her apartment if you're spending time in Athens.