We enjoyed our stay in the Caldera House apartment. The view is stunning, you can see most of the caldera and watching the sunset from the balcony is magical! Catherine was very obliging and organised us an awesome trip, she's a great host! Unfortunately the price-performance ratio isn't that good. The kitchen has seen its best days and especially the oven was very dirty and definitely not cleaned before our arrival. Also the bathroom had a strange smell and the douche cabine has not really been cleaned roundly. The bathroom is quite small and there's almost no tray area. Therefore I wouldn't really recommend the apartment for four adults.
You have to keep in mind that this area with the caldera view is highly expensive, so you're paying mainly for the stunning view. We had an enjoyable few days in this apartment and would recommend it to everyone who doesn't necessarily need a kitchen and wants to have a nice balcony with view!