Elvira is a truly welcoming, thoughtful and accommodating host - we had an excellent stay at "Cocoon" in Sensyo Caves.
"Cocoon" is the smallest of the cave homes at Sensyo, with a studio room consisting of double bed, small seating area and fridge / kitchen sink, but its size definitely lends to the cozy feeling of the apartment and, for us, was ample space for our very simple requirements. Part of the reason for this is the fact that there is also a large outdoor terrace, shared with two of the other cave homes at Sensyo, but with easily enough space to either relax on your own or mingle with the other guests, as you prefer. Whichever you choose, the caldera view is breathtaking - relaxing on a deckchair with my feet up, kindle in one hand, cold beer in the other, soaking up that spectacular view was perfection.
Being a cave house with little ventilation, the room can definitely get quite hot at times, but Elvira was also kind enough to provide us with an electric fan, to help cool ourselves and make it easy to sleep.
The apartment is located in Firostefani, a tiny village, with a handful of restaurants, fast food souvlaki and mini markets to easily cater to your immediate needs, yet due to its size, is also extremely peaceful. The larger village of Fira is truly less than 10 walk away and, if you choose to take the caldera side path, you'll be treated to some of those hard to believe views. In Fira, there are large selections of restaurants, bars, fast food, shops, car / ATV hires etc. - basically, pretty much whatever you may need.
I would also recommend the hike (and clamber) to Skaros, for beautiful panoramic views of the caldera.
Overall, we had a lovely time at Sensyo and would readily recommend it to anyone after clean, cosy accommodation with a stunning view.