Two words: the view. Marble Sun in Oia is quite possibly the most beautiful place we've been to. The view of the Caldera from the deck is stunning - indescribable. The apartment itself is tastefully designed, in a modern and comfortable way. We were two couples in our late 20s staying and it was perfect. The downstairs 'Greek Cave Room' was definitely warmer than the upstairs room with the air con but it was fine. The apartment had everything you needed and more. Great location and Nicolas and the person who met us were both lovely. Can agree with other reviewers in the fact that the Internet is a dongle, so unless you've brought a laptop with a USB point, it won't work for you. Would not hesitate at all in recommending Marble Sun to others :)