This place is absolutely stunning! Elkaza Villas has a couple of rooms named differently (ours was called Couple Villa) located on the second floor. It is a large, very spacious place with a fully-equipped kitchen (included an electric stove, toaster, fridge, plates, utensils, etc) and a large bathroom. The bedroom is humongous, featuring a balcony that overlooked small towns and the water, and you can see the sunrise right across the horizon.
Santorini is a complex of main roads for vehicles and small intersecting alleyways (with lots of up/downhills) for pedestrians. We had decided to walk in the afternoon heat to the villa, which should have only taken 15 minutes along the main road. This is definitely NOT the best way, and I suggest you get familiar with the small alleyways away from vehicles to get there (it is actually provided in the directions by Eleftheria once you book, but in the moment, it was hard to realize where we were). Once you figure out where you're going, it doesn't take more than 10 minutes to reach the main town of Fira. There is also a bus stop that goes straight to Oia less than 10 mins away in the other direction, instead of walking all the way back to the main bus stop.
The space gets cleaned every second day and the reception is open between 9:30am and 1:30PM only. There was someone waiting to let us into the room when we had arrived around 3PM, but he left shortly after. The kitchen is great to cook in, but it was missing some basic ingredients to cook with (we'd only need a tiny amount of olive oil, for example, but I wouldn't want to go buy an entire bottle myself). There are doors that separate the bedroom from the bathroom/kitchen, which is great because there seemed to be a slight smell from the bathroom which I didn't like.
Eleftheria was really quick about answering our messages, and had arranged for a transfer from the villa to the port for 20EUR via taxi. Well worth it for us, as we didn't want to deal with luggage+stairs+crowded bus to catch our early ferry.