Elias is fantastic. He is more than just a host; he's very transparent, and clearly loves Santorini. He runs Ersi Villas for a living, and is a friendly guide to the island of Santorini. He provides a good map of the region, and has awesome suggestions. He communicates regularly and speaks flawless English.
The rooms themselves were clean with running hot water and a window HVAC system. The Villa itself is simply gorgeous.
Ersi Villas is super close to Firostefani, which has fantastic views, restaurants, and shopping. It only takes less than five minutes to walk there from Ersi Villas. You can rent an ATV for travel next door but they're a little seedy; Elias would probably recommend you go to one of the other ATV rentals in Fira.
I'd come back for sure.