Stelios appartment is clean and newly furbished. The balcony is very big and comfortable. Bed is very comfortable. The neighbourhood is within walking distance (15-20 min) to the very heart of Athens. We never used a metro because of that. The area is not fancy but there are many small bars and restaurants just accross the railway tracks. Very Good place to have a drink and eat is called Koroba.
Stelios is very nice guy, very friendly and responsive. He also provides an airport pick up for a fee. We arrived very late almost at midnight and he had no problems with that, also allowed us to keep our lugage after check out hours.