Unfortunately, all too many of the beautiful neoclassical buildings of the 19th century were demolished during Athens's rapid expansion after WWII, but several have survived.
“The neoclassical houses of Athens are like a flock of young girls wearing their first evening dress and their first formal necklace and earrings - some graceful, some giggling, some of them awkward in their mother’s “classical” clothes. These houses give youth back to a city that seems exhausted.”
(From “Dinner with Persephone - Travels in Greece”, by Patricia Storace, New York 1997,