I have such a good stay at Sokol's . It's not too far from Monastiraki metro station where restaurants and shops and tourist attraction are there.
The apartment is close to the main street, so I feel really safe to stay and to walk back to apt at night after going out. The room is small but has everything you need (even scissors!). I would definitely recommend this apt and I would come back to stay here again if I visit Athens. 😃