We enjoyed our stay at Menia's cave house. The view was epic, the beds are super cozy and the floor heating is superb. We appreciated help carrying our luggage to the apartment, as there were a bunch of steep steps. December in Oia is almost silent, only the sound of the waves and donkeys. Just be aware that there is only one restaurant open in Oia - the people of Santorini take their holidays in December and January and nearly all the shops were closed. Good if you're looking for peace and quiet.