I definitely recommend Haroula and her cozy apartment! Haroula is a gem - she's communicative, helpful, and incredibly sweet. The day before my trip she sent me detailed metro directions to the apartment from the airport, and check-in was a breeze. We really enjoyed the area - it was about a 15 minute walk from the central market, and there are tons of delicious restaurants with local prices (i.e. much cheaper than Plaka and other more touristy spots). It's about a 30 min walk from Syntagma square, a main square in the city, so things are very accessible. Definitely recommend this spot!