Everything about our stay with Stelios was perfect. We organised a transfer from the airport with him as we got in too late to get the metro. When we arrived at the apartment the driver showed us where to go for the keys. The apartment itself was spotless and as we arrived so late Stelios even offered us a later check out time of 3pm. The next day we didn't want to leave!
One thing to mention is as we came in so late, when we got out of the elevator there was no lights on the 4th floor. We ended up pressing someone's doorbell by mistake at 1 in the morning, thinking it was a light switch! This wasn't Stelios' fault but perhaps warning people about that in future would not be a bad idea.
We could not recommend this place enough if you are visiting Athens.