As are the islands. Went to the Aegean islands at easter, a few years ago. Only did two or three. I sniffed around, briefly considering buying a small whitewashed cottage and taking retirement there. The people are lovely, and the euro goes a lot further than anywhere else in Europe, especially off season, except for perhaps parts of inland Portugal. In the end, it would have been one hell of a jump for me. I don't speak one word of Greek, and it's kind of too late to learn (everybody does not speak English, as indeed why should they?). Also, in the winter, the ferries don't necessarily run more than once a week or so. Once you're on your island, you're on it. Unless it's one of the big, known ones, like Santorino.
Athens is a fine town. The Acropolis, lit up at night, is glorious. Contemplating that from a café terrace, with a good glass of red in your hand and some olives, people watching… brilliant.