Location location location. The best view. We watched as everybody lined up to watch the famous Oia sunset on the castle steps but we were in the luxury of our terrace everyday.
The apt is at the north end of Oia above Ammoudi bay. I will warn that you should be able to go up and down significant amount of stairs to get to the apt. The view is well worth the work. Oia is definitely not for those afraid of heights.
The apt was spare and clean but just what I liked. You can hide from the mid day sun in the apt or open the doors for light. The terrace was wonderful! We sat there for hours. You get daily fresh towels/maid service and breakfast delivered. Would definitely return.
Panos was quick to answer questions and helpful in setting up transfers and help with luggage. DEFINITELY get help with luggage and be ready to tip well. The guys deserve it.
Fyi - if the wifi dies, just reset it. The router is in the outside closet with cleaning supplies.
Oia is a nice town with a main walking shop area with restaurants and views. I prefer it to Fira as it's quite and more charming. You can catch the bus to Fira from the bus station every 20 minutes. It's 10 minute walk from the apt...lots of steps.
Enjoy!