Merovigla was exactly right for our stay on Santorini. The studio was clean and comfortable for three people, plus it had a kitchenette, which was nice, and air conditioning was a life saver...but none of that matters because the only important thing is THE VIEW! Stunning! We would wake up each morning and throw the windows open to drink in the caldera. Couldn't get enough. All of the staff we encountered were incredible as well. So sweet and extremely helpful. One note: this is actually more of a hotel than a private AirB&B, so it was great to have the homey feel + the hotel accommodations (pool! maid service!) BUT front end communication via AirB&B site was basically nonexistent. I wish I had realized it was a hotel facility earlier, as I was a little panicked about the lack of response, but when we arrived, everything was perfect. So check out the website and CALL them if you have any questions, as they won't respond through the AirB&B website.
Our stay with Alexandros was marvelous! The studio apartment was exactly what we needed, and we had the most amazing view of the caldera. Alexandros was accommodating, especially when our ferry was delayed and he let us check back into our room while we waited. I couldn't imagine staying at a better spot, and would highly recommend his hospitality and accommodations to anyone looking to stay in Santorini.