I just spent a week at the Alb. Roberta. Nadia and Felice, who run the Roberta, are just about the nicest hotel owners I've ever met. They allowed me to change my reservation at the last minute without a hassle and helped arrange taxis too and from Sarteano. The food is wonderful and affordable. It's served family style which means you'll probably be offered more food than you can finish! I look forward to going back again.