Sofia made us feel so welcome when at the apartment, left us some fruit for when we arrived, and came to clean the apartment every few days, which was much appreciated!
We were in the apartment for two weeks in the winter, so it was pretty cold, but in the summer it would be great!
The walk to the metro is only about 5 minutes, and the area has a lot of fast food etc, but if you're after night life, views of the Acropolis, and nice cafes/restaurants etc, something nearer the city would probably be a bit better as Metros don't run too late, and it's about a 45-60 minute walk into the center.