Sylvia's place was perfectly, centrally located to explore Athens on foot (I didn't use the metro at all, except for getting to and from the airport). You are within walking distance to all the sights and all the action. Sylvia was a beautiful host who welcomed me warmly, had lots of tips for exploring the city, made me feel very welcome and at home, and very kindly drove to the metro station at 5am when I was heading to the airport. Definitely recommend Sylvia's place for your stay in Athens!