Not much to write that hasn't already been written. Camere Andrei is the best choice for the traveler who demands quality and value.
I've stayed in Pienza and its environs more than a dozen times and have lodged at several inns and B&Bs. All have proven affordable, clean, comfortable and well managed, but Camere Andrei is the best in all respects. The rooms and common areas are tastefully appointed and clean. Breakfast is ample, and Andrei makes it a point to ensure his guests are well taken care of. Prices are also quite fair. Although parking is a little tight, there should be enough for all guests even when the inn is at full capacity.
The building is set off about 100m from the town center, and this is an advantage as it has much better lighting than the accommodations in the town proper. Very good restaurants and convenience stores are within a 5 minute walk. And, of course, Pienza has many attractions for the traveler interested in history and culture.
Camere Andrei will be my first choice when I return to the Val d'Orcia.