This is an opportunity to spend a few nights in a beautiful, clean, extremely quiet, genuine Santorini cave. The view from the terrace overlooking the caldera is amazing. You can view the morning light illuminating the caldera and Imerovilgi in the distance, and enjoy as good a sunset as from Oia. Elvira's restaurant recommendations were helpful. Firostefani, while still very touristed, is not as overwhelmed with tourists as Fira, and the opportunity to explore Fira is only a short walk by either the more scenic route (20 minutes) or the more direct but less scenic route (7 minutes).
Of special note is that Elvira was willing and able to go above and beyond what might have been expected of a host to facilitate transportation arrangements to the Fira hospital when we had an unforeseen medical emergency.