I feel extremely confident in saying that this is the best possible place you could stay in Santorini.
Ammoudi Bay sits at the foot of Oia, a beautiful town that is the postcard representation of the Greek islands. The only (and I must stress only) downside to this location is the trek required to get up to Oia from Ammoudi Bay. The set of stairs to get up trend towards the treacherous side and there are 200+ of them. Walking up is a real workout and will require stops to catch your breath. Going down is not as bad but still requires concentration to ensure no slips.
The good news is that Christina was more than helpful and at any moment's notice would arrange a car to bring us to the top of Oia (or any other place on the island). This was extremely worth is as it was only 10 Euro to get to the top and saved us a grueling trip.
The apartment itself is gorgeous and perfectly situated. As the middle apartment in the building it has the perfect view of the bay and even includes a private terrace that looks out over the bay. We enjoyed winding the night down on the terrace with a glass of wine and seeing Ammoudi Bay close up. There are a handful of restaurants right along the bay that all serve incredible food. The sound of the water in the bay is incredibly peaceful and makes for a wonderful way to fall asleep/wake up in the morning.
There is a cleaning service that comes every day to the apartment which was an unexpected but very nice amenity. It was very refreshing to return from a long day of sightseeing to a clean apartment. The apartment has everything you could need with a full kitchen, a spacious bathroom, and a very comfortable bed.
Christina was an incredible host as well. Upon arrival she provided us with an amazing list of recommendations for restaurants, activities, beaches, and more. We followed her recommendation for a smaller beach that was incredible (Vlychada Beach) and a restaurant nearby that was one of our favorite meals.
In addition to the recommendations, as previously mentioned Christina was incredibly responsive and went above and beyond in terms of helping us coordinate any rides we needed or making a reservation for us so we could have an amazing sunset dinner.
This is the best Airbnb experience I have ever had in terms of location, host, and the apartment itself. I will be recommending this place to all of my friends and really hope we can make it back here one day. Do yourself a favor and book a stay in Ammoudi Bay with Nicoletta, Christina, and Alexandra.