Yiannis is kind and caring host with tonnes of reccomendations and advice for those staying on the island. Whether it's your first for 50th trip to Santorini I would reccomend staying here. This room in particular has the benefit of a private hot tub jaccuzi which allows you to enjoy the ocean views well into the evening, so couldn't reccomend it more.
Imerovigli is a great location as it's not as busy as Oia while still being as beautiful and with much better views of the sunset. While this Airbnb is east facing so you don't get the sunset directly it is a very short walk to a great vantage point to see the sun setting on the water. Ask Yiannis for advice on where best to see it!