Best Mezedopouleon is Xoxlidaki at 31 Adrianeiou St in Nea Psyhiko but good luck finding it. (take the 13 or 14 trolley to the last stop at Platia Agia Sophias and walk back 3 blocks and take a left on Adrianeiou.) If this is too hard try To Kafeneon on Epiharmou street in the Plaka