Miaouli Lofts is a great place to stay. Corinna welcomed us when we arrived by taxi on the Square (could have the metro also), so we immedeately felt very welcome. It is a great loft on a very central location. The dynamics in the city is something you feel and hear, but no 'hinder'. It really is a loft: spacious, everything around and even Corinna took care of coffee, tea, milk and more.
Our advice: do not look further, this is probably one of the best places to stay when you visit Athens.