The house: a generously proportioned old stone house with plenty of charm. Thanks to the thick stone walls, it kept reasonably cool during the recent heatwave. There are plenty of indoor and outdoor spaces, and the house is surrounded by greenery, trees, and the vineyard. There are wild figs growing nearby, and we spotted quite a few animals at dusk and dawn (foxes, a hoopoe, bats, deer, etc.). As it's located on top of one of Umbria's famous tuff hills, it offers stunning views of the surrounding landscape. I particularly liked the road, with imposing stone pines lining up on either side leading up to the house. The pool is huge; we had it almost always to ourselves.
The surroundings: Orvieto is surprisingly attractive; we visited the Duomo, the St. Patrick's Well, the underground Etruscan city, and enjoyed the many excellent restaurants. (Watch the YouTube clip from Rick Steve; he also does one on the winery nearby.) Orvieto is perfect for day trips to Rome, Assisi, Lago di Bolsena, Terme di Saturnia, Lago Trasimenio, and, an absolute highlight, Marmore Waterfalls, where we also did some whitewater rafting in the river Nera.
Our hosts were very friendly and welcoming, and super responsive to all of our questions. It's very convenient that they are close by at the winery and there when you need help, but otherwise you have the huge space and surrounding area entirely to yourself. I would also recommend going to a wine tasting; the quality is superb and very affordable