I spent one week in Sokols appartement and I really enjoyed it. From the roof terrace you have a wonderful view all over the town and it is located very central - just a 10 min walk to Monasteraki or to Gazi District. The appartemnt is tiny, but very modern and everything works perfectly there.
Sokol really took care that I´m feeling comfortable. On my departure he also brought me with his car to the metro station.
Next time in Athens I definitely will stay there again.