I would highly recommend staying at Costas's apartment for anyone visiting Athens. It was very clean with all the amenities you could want (kitchen with food provided, tv, board games). The apartment is exactly as shown in the pictures. Costas's parents met us at check in and we're very helpful and friendly. Location is close to the metro, about a 30 minute walk from the Acropolis etc. and around the corner from a street with lots of bars and restaurants. Would definitely stay with Costas again if I'm back in Athens again!