Theodore is hands-down one of the best hosts you will come across. He gave my wife and I a lot of super helpful tips and suggestions about Athens (food, transportation, things to do, etc) when we arrived. He was responsive and reliable our entire stay.
As for the apartment- we loved the location because it was away from the super busy part of town, but within walking distance of the metro (which was a quick ride into the main part of the city). There is a beautiful view of the city and of the Acropolis from the patio. It was very clean and comfortable. I would highly recommend staying here.