Modern studio in a great location in Athens, close to the metro (with direct access to the airport), shopping, food and archeological sites. Only downside is there's a machine shop or something under the apartment which starts work at around 730am. It mostly wasn't an issue since we were up anyways but may be bothersome to some.
Overall, I would recommend staying here. Stelios was very responsive and helpful, picking us up at the metro station and pointing out a number of delicious places for food near the apartment.