Location location location! An incredible location! Bring your walking shoes for the stairs, though.
Maria arranged transport and porter assistance to and from the airport. This is an essential service. I'm pretty sure we would have never found the place without help and we would have had a terrible time lugging the baggage. A gentleman named "EF" greeted us at the apartment and gave us a wonderful briefing about the island, neighborhoods, restaurants, and things to do. Very helpful and much appreciated.
WiFi/Internet service was quite good. We didn't go there to surf the net, but it was great having the service to enable us to look for restaurants and activities.
A couple complaints, though. Biggest one was that the bathroom door would not close. With five people sharing one bathroom this was uncomfortable for everyone. We did bring the door closing issue to the attention of EF on the second day but it was not addressed during our week long stay. There was a lot of construction going on, likely in preparation for the peak season, so I suspect it was difficult to get someone there to fix the door in a timely manner. But in my opinion this should have been repaired before we arrived.
There was a moldy smell in the bedrooms. There was one de-humidifier in the master which took care of the issue in that room after it operated for 1/2 day or so. But no unit in the other bedroom. No dryer, and with humidity so high we did not attempt to do laundry. One note about Oia (obviously not the host's fault) is that the electricity in the neighborhood was highly unstable. One morning we had to take the bus to another town to get coffee and breakfast. I believe we counted 5 power outages, some lasting several hours.
Overall though, it was a great trip. The services provided by Maria were so appreciated. And the view from the place is simply incredible!