9th Heaven is the gem of Athens! The apartment is bright, clean, tastefully decorated and the location is very convenient, close the toe metro, although you can even walk to the Acropolis and Syntagma square. The neighbourhood is safe and very pleasant too. The unobstructed panoramic view is its highlight and is something I believe you don't get often in this city, as this is one of the rare residential towers. Even though I wasn't greeted by Ilias himself, he was very cooperative and the communication with him went really smoothly.
So, if you're looking for a good base is Athens, don't hesitate to book this place!