The pictures show the location perfectly and at the same time the view and experience to be had doesn't do it justice.
The arranged transportation for your group was there on time (even though our ferry was not) and you get to experience a scenic drive along the way to Oia.
Tina met us at the drop off and let us know everything about the apartment and surround neighbourhood that we needed to know. Everything is within walking distance (groceries, banks, restaurants and of course the sunset!) and the town of Oia really is beautiful even beyond the Caldera view which you will have everyday.
The climb up from Ammoudi Bay is a work out so be prepared. The little island (Armeni - though not much of a "beach") you can see from the patio is accessible by foot if you go to the left once you get down to Ammoudi Bay. It is worth a visit, swim and a quick jump off the ledge.
Going Northwest from Oia you can also access Kantharos beach (about a 20 minute walk) which is unique with its volcanic rocks. It's not too busy and we recommend water shoes as well for getting in the water. Not much shade either if that is an issue, but easily the closest beach without having to go to the opposite end of the island.
Lastly we had an incredible time on the catamaran which visited the hot springs, red and white beaches. Most of your time is spend on (or jumping off) the boat but the crew was great and it makes for an incredible experience.

**Tip: if you visit the hot/sulfur springs don't wear a bathing suit with white in it as the sulfur will discolour it and turn it orangey.**

There will be tourists you will have to deal with daily to get to the house but thankfully the strategically placed gate at the top of the house keeps them from ever getting "too" close. You can't blame them as the view is incredible and you will understand why.
To view the sunset, just head past the crowd of people at the top of the hill/stairs. A few steps down you're likely to find an open and uncrowded spot the enjoy Oia's main attraction. Make sure to bring a camera and a drink ;)