We loved our stay at Giannis and would absolutely recommend it to others. It was a great location with a sunrise view from the apartment, 5 mins walk from a beautiful sunset and within easy walking distance of Fira town centre. Giannis and his family were very welcoming and provided great recommendations for restaurants on the island. We also enjoyed the room service breakfast on our terrace overlooking the sea.
The only downside was the apartment didn't have two separate bedrooms as we had thought from the advert, it was much more open with one proper double bedroom and another double bed tucked around a corner. It would be great for a couple with one or two children but less ideal for 4 adults, particularly if privacy is really important. It didn't bother us too much though and the great things about this place definitely outweighed this.
If we go back to Santorini I'm sure we would stay here again.