Efthimis was a great host before we even arrived! He was very responsive to our questions and prepared a detailed set if instructions for getting to his flat from the airport (which is super easy).
When we arrived to Athens, Efthimis let us in, and gave us a 20 minute or so introduction to the city, complete with a map! The flat is also very spacious and accomodating, and he even went so far as to make us breakfast muffins!