Look nowhere else when considering an apartment with full Caldera views and a private pool. When I say private I mean that nearly no one can look onto your balcony and private heated pool. This is quite rare in Santorini. Also, this place has a very big private balcony and the kitchen and main bedroom have windows. Again, not that usual in Santorini. I was told that apartments in the same area book for 2 to 3 times the price of this one so it's a bargain as well (yes it is expensive but this is Santorini where any accomodation close to the Caldera is expensive).
The place has all amenities you expect including fast WIFI, fully equipped kitchen, new towls every day. The service was outstanding (organising a hire car etc).
The location is in the quiter part of Oia but you can easily walk to everything. A small supermarket is very close. We loved the location but if you want to be in the thick of things, consider Thiera as Oia is a bit quiter.
Highly recommended.