Aris's place was amazing, much better than we expected. :) The flat is spacious, full furnished with everything you need, even more. It has big balcony as well, perfect for morning coffee. The flat is in great neighborhood Kerameikos, 500m from metro station Kerameikos (blue line which goes from an airport).
On the first corner you can find bakery and pharmacy, and on the next corner from those two you can find supermarket. If you like to explore the city by foot you will not need public transport at all.
And last and most important, Aris is the perfect host, the check in was great, he waited for us in front of our building, explained everything we needed to know about the flat and the city and gave us freedom to contact him anytime for any question. I am definitely going to choose this place next time I come to Athens.
Thanks Aris for everything! :)