If there was an award for most amazing host on AirBNB, Nicholas would probably win.
You can read the reviews for hours and I am sure Nicholas would still find a way to exceed your expectations.
He helped us create an itinerary to fit all the activities that we wanted to do and then booked everything for us. When we arrived he met us at the house and welcomed us with an overview of the house and then gave us additional recommendations for activities, restaurants, and answered any questions we had.
The Grand Cave House is a short walk from anything you are looking to do in Fira and has a beautiful rooftop terrace with pool overlooking the sea to the East. Don't be sorry, book it while it is still available.