The stay at Αφεντούλα's place was great. Αφεντούλα is very nice person, she gave me tips on the area and she checked many times if everything was fine. Her flat was super-clean and has everything you might need, even a washing machine with dryer.
The location is really good as it's walking distance to the main attractions, but not right on a busy road.
The flat has only two downsides: first is that the door is not sound proof, so it could be noisy when cars are passing by, and second is that there's not much natural light, as there are only two windows but direct sun is always covered by the front building. As we stayed in the flat just for sleeping, for us it was not a big deal at all.
I would definitely recommend Αφεντούλα's place!