My husband and I spent four April evenings in Athens at Toni's place and we couldn't recommend it more.
Toni's place is clean, comfortable, spacious for two, and in the perfect location for adventuring. The apartment is in a hip, local area that isn't congested with overpriced tourist traps. Some of our favorite places were within steps of the apartment door: Athens Bakery, The Dark Side of Chocolate, and Hi-Fai Grillhouse. It is also close to a metro station for easy access to public transportation.
Toni was helpful and quick to respond to all of our questions. His friend who checked us in was very welcoming and took the time to give us a tour of the apartment and point out his favorite spots on the map.
When you come to Athens, stay here. You'll be glad you did.