Panagia of Platsani is the main church in Oia and is located at the center of the village. Visit are permitted but photography inside is forbidden. The inside is specifically Greek Orthodox. Very small but pretty and the smell of incense surrounds you.
The square is also the main meeting point for travel groups big and small so you can imagine the amount of people here.
If you want to enjoy this beautiful space, visiting at sunrise is the way.