Helios Cave House is an amazing place to stay in Oia. It was spacious, super clean, and had everything needed for a comfortable short-term stay. A couple of wine bottles were even included. Maria was very responsive and easy to get in touch with, and she was extremely accommodating about our check in and check out times. We also enjoyed the private balcony, although note that if you visit in winter, your view of the sunset will not be as direct as in the summer (you can have a better view further south down the island during the winter). We would happily stay here again if we come back to Santorini.