Grigoris and his place are great! You can't ask for a better location - right in the middle of Monstiraki square, walking distance to literally everything you could need.
Grigoris was great and met us at the metro station and took us to the house, showed us at the places we should visit and gave us a map. He was very quick to respond and made sure we had everything we needed.
The house itself has a beautiful view of the Acropolis and we really enjoyed sitting out on the balcony and looking out over Athens. The house was clean and spacious and was just what we were looking for.