Elias is very nice and helpful.
He comes to pick you up at the bus terminal. It is very practical.
His place is in a nice area at a throw of stone of Fira's center.
The Ersi villas is a more or less 12 flats around a swimming pool. Every flat has its own balcony.
The breakfast is very good and taking it around the swimming pool sounds really like holidays.
For Santorini, it's a very good value for money.
Elias is very available and he is a good adviser to help you discover the island.
Don't miss the walk to OIA. It is an amazing walk.