Yannis & Helene are nice, quick respond, and gave us detailed instruction from airport to the apartment. The apartment is clean and modern-decorated. It only takes 10 minutes walking to Temple of Olympian Zeus and 20 minutes to Syntagma Square. The view of Acropolis from the balcony is definitely the highlight. However, I have to mention there might be traffic noise since it's on a busy street. Generally, I highly recommend the apartment for anyone traveling in central Athens.