Vivi met us when we arrived and showed us to the apartment, as well as explained everything to us, where restaurants, sunset views, etc were. She was lovely
The apartment is very comfortable and clean, they even left out some local wine for us to try and a few condiments if we needed them. It's within 2 minutes walking distance to all of the shops, restaurants and bars.
Just make sure the doors are closed properly, otherwise the air conditioner will not work, we found this the hard way.
We really enjoyed our stay in Santorini and in Vivi's apartment, I would highly recommend this place.