Vasiliki's studio was perfect for our visit to Santorini. Just two minutes from both the beach and the bus stop, it's quite convenient for enjoying Kamari Beach and as a jumping off point for visiting the other towns on the island. The apartment was clean and well-kept, with a lovely porch that looked out over the pool and the sea. We didn't cook much, but the kitchen had everything we needed.
We didn't cross paths with Vasiliki until the last day of our trip, but we communicated frequently via Airbnb messaging. She answered our questions about buses and restaurants very promptly!
Overall, a great and economical choice for a place to stay on Santorini. That said, the action is definitely mostly in Fira and Ia (with their much pricier accommodations) so be prepared to spend some time and money on transportation between Kamari and the other towns if you don't rent a car or moto. Most bus routes--at least at this early point in the tourist season when we visited--go to and from Fira, so to go from Kamari to Ia, for instance, takes two buses (each at about 1.60 euro/ticket): Kamari to Fira, then Fira to Ia. Completely doable--just requires a bit of schedule coordinating!
A final tip: our favorite part of our Santorini trip was our walk from Fira to Ia along the coast of the caldera. It took just under three hours, all on clear paths, and offered stunning views of the island.