No one says a cave dwelling can’t have a crisp, chipper vibe, and this ancient house that’s partly dug into the hillside at the foot of Sassi Caveoso is downright cheerful. Contemporary touches in the bright lounge and guest rooms include a floating staircase, a sunken sitting area in front of a crackling fire, and large, state-of-the-art bathrooms. Papevero is an especially appealing room, with high wooden ceilings and a large terrace.