We had an awesome stay at Athina's.
Location is fantastic in a hip neighborhood with plenty of food and bars around and easy walk to the metro. Athina's apartment itself is lovely - super clean with gorgeous balconies and a good sized kitchen and eating area. The black-out roll shutters on the windows were nice for sleeping late, and the place was quiet. The shower is small, but good - steady hot water and good pressure. We slept on the master bed, and it was comfortable.
Internet was good enough for streaming Netflix and Spotify. Didn't do a speed test, but we also didn't have any problems with Internet - seemed fast and good.