We had spent at Esi's appartment 3 days and 3 nights .It is really great - very clean, spacious, with a big balcony where you can sit with friends and have a good time drinking wine :). What's the most important - it's really close to the city center with many sightseeing places (just around 7 minutes on foot to the Panathenaic Stadium).
Esi is a nice and helpful woman, she was waiting for us at the appartment (it was already midnight) to show us everything and give many advices what to see in Athens.
I can highly recommend Esi as a host!