Blue Moon Villa is a fantastic stay. The view is SO great - looking down towards Fira and out to the South of Santorini. You can watch the cruise boats coming in and out of the Old Port. Imerovigli is a little less trafficked compared to Fira and Oia but still walking distance to plenty of restaurants and shops. It is a great area to catch sunset from - just a short walk to the point you can see Oia from the pedestrian path or hike out to Skaros rock.
Costis is the best AirBnB host we've ever had the pleasure to meet. He was very communicative, helpful with information about the island (history, how to get around, recommendations). He had amazing personal touches for our stay (welcome gift, snacks, drinks, slippers, coffee with espresso, French press and Greek coffee makers, clothing hanger for laundry and more).
I would highly recommend staying here during your visit to Santorini. The room view is stunning, space is well put together and comfy, and Costis is a wonderful host.