I couldn't have asked for a better 1 month in Athens at Costas's place. You'll read a lot of interesting things about Exarchia, but the neighborhood is safe, full of so many things to do + great people, and is close to anything you want to get to. The apartment itself was super spacious, clean, and made it easy to feel like home. Costas was always responsive if I needed something, and went above & beyond to give me recommendations (in Athens itself, but I'm traveling long-term around the region, and he even gave me recommendations for other countries). I would definitely stay here again!