Modern basic apartment at a stone throw distance from Acropolis. The balcony borders with the back of the police station, so your belongings couldn't be more safe (not that that has ever been an issue in Koukaki. The area is very safe). Comfortable bed, good shower, and basic kitchen utensils etc. available.
Cell phone reception and WiFi Internet connection were very poor at times, due to the apartments location on the ground floor, surrounded by lots of concrete. For a business traveler like me this could be a bit of an issue, but shouldn't be of any concern if you're visiting to see the city.
Countless very nice places for breakfast, lunch, dinner and drinks, and metro station "Fix" are right around the corner.
Check-in and communication was flawless. I'd be happy to stay again in an UpStreet apartment.