The Pori cave house is a house that is divided into 2 houses adjacent to one another. It was perfect for our group of 7 people.
The plus side of this house is that you get to enjoy the unobstructed breathtaking view of the caldera, sea n volcanic island, you get to have 2 washrooms which is very important when you stay with a bigger group and you get to have a kitchen that was functional with all pots and pans to prepare meals.
The only down side I can think of is the amount of narrow steep steps you need to walk everytime you want to go out and come back to the house. But I guess if you want a view that is more private and away from the main streets, that is necessary.