The apartment is beautiful, wouldn't change anything from it!
The location is close to Oía, but I would recommend taking the bus on a hot day, since it can take about 25min to get there walking. Take into account local buses don't always stop so you might need to wait a while for the next one. Other than that, Finikia, were the apartment is located, felt more like a local neighbourhood to me, which I liked. It has 3 restaurants (one of them is really great!) in case you want to have dinner there at the end of the day (they are not open for breakfast but the apartment has a fully equipped kitchen to cook).
Margarita was very helpful organizing our pick-up and departure taxis. They pick you up close to the apartment (5-10min walk) and Margarita made sure there was someone to help carrying the luggage up to the pick-up place, which might be a little challenging.
If you are looking for a great apartment and a quite place to stay, but close enough to Oía, this is a great place.