You have to book this hotel because it has the BEST view of the sunset. You will have the front seat when it comes to sunset scenery. You will see people around you, by the steps, by the cliff of the Oia castle trying to have a view of the sunset, while you chill at your designated lounge area, with a glass of wine watching the beautiful sun to set (Wear your sunglasses btw).
It is not only the sunset the main reason to stay here, but the staff are amazing and friendly. Elena (front desk) will help you book anything you need, just ask her, she's going to tell you the activities around the area. Nitay (if I spelled it right) will help you with your luggage because Oia street is not as friendly as you think, its is very steep, narrow and slippery. Make sure to give him a generous tip. Lastly, Katie - she is the one who keeps your room clean and serve you breakfast and she's a very nice lady.
The best part about this location is it's not in the direct sunlight in the morning, so you will enjoy eating your breakfast outside your balcony. The other side of Oia is where the sun rise and it gets so hot.