I have stayed in Airbnb's in more than 20+ countries, and I always return to Milto's flat in Athens. I refer friends to him as well.
One of the best apartments you will ever find. Clean, modern, well-designed. And in great location near historical sites, restaurants and shopping...in one of the oldest neighborhoods in all of Europe.
Miltos is an excellent host, and is always helpful.
Highly recommended. You will not find a better place to stay in Greece, and maybe not in the entire world.