I can absolutely recommend to stay at Ersi Villas!
Elias is a really good host, always available to give advices regarding transportation around the island and things to do or to visit in Santorini. Moreover, we needed to do a late check-in and he was kind to wait for us till very late!
The room has everything you need and is cleaned every day, it has a nice terrace where you can chill and enjoy the view to the sea on the east coast of the island.
The location is also very good, you can walk to Fira in 10 minutes where all the buses are going to bring you everywhere you need, or you can walk to Firostefani in one minute and take the bus to Oia.
Santorini is really beautiful and you will have a perfect stay at Elias' Ersi Villas!