I stayed in Ismini's apartment with my boyfriend for two nights, which I think is all you need to see the main historical sights in Athens. Ismini's apartment was perfect for us. It is in a very young and trendy area. It is only a few blocks away from the metro and super close to the National Archaeological Museum, which is worth going to. Ismini is a very kind host and has lots of information on Athens if need be. Definitely recommended for a short stay in Athens. Thank you Ismini!