Ionna's place is not an oceanfront location, but it's within walking distance of the main square and all the main sights of Oia. They arranged an airport transfer and the driver was waiting for us upon arrival. We were greeted by Maria at the apartment and were able to check-in a little earlier than the standard time, which was much appreciated.
The apartment itself is very nice and stylish. It should be noted that there is a restaurant that has a direct view of the balcony, so there's no privacy there. Overall, we had a pleasant stay. However, on our last day there, I opened the door of the balcony very early in the morning and found a man working in the space. I don't even know how he had access, but needless to say, we couldn't use the hot tub or balcony that day. I was there with my sister and we didn't know why there was a man in a part of the apartment that we had assumed was inaccessible to others, so imagine the concern. We had not been notified that this would happen.
By the time we got dressed and headed out for breakfast, there were several men painting the balcony and roof. And by the time we returned from breakfast, they had painted the area around the steps used to access the apartment, so it was difficult to get our luggage out while attempting to not get fresh paint on it. All of this happened prior to our check-out time.
All of that said, if you want to stay at Ionna's place, make sure that you won't have any unexpected visitors / scheduled work during your time there and you should be fine.