I had a wonderful stay at Irene's and Michalis' place - the only thing to complain about: it was just too short to enjoy all advantages of their tastefully decorated apartment! :-)
Be assured this place is just lovely (a real gem, exactly as described) and very well located in a nice neighbourhood from where you can easily start discovering the city (just a very short walk to the metro, the supermarket, nice bistros...).
Besides that I'd also like to stress that even if I didn't meet Irene and Michalis in person they both made sure everything was ok by sending a close friend and keeping my updated by mail.
In short: Thank you both for making me feel at home during my visit to Athens!