Marino's is a great host, very helpful and caring, to the point of leaving a local cell phone so we didn't have to use our's during the stay.
The view is spectacular, and Imerovigli is really the best choice: you are at walking distance to Fira, there are plenty of places to eat, the whole area is quiet, and Anastasi Church is just 50 meters away, so we had the chance to see many couples getting married.
The terraces to see the sunset are not as crowded as they are in Oía. You can get good places without needing to be there for hours. Theoskepasti chapel is a very good alternative.
Highly recommended is Skaros rock trekking. It is just minutes away, and from there you have both the sunset view as well as the view of Imerovigli and Fira illuminated by the setting sun.