We recently stayed at Meuble il Riccio for our honeymoon. Simona, one of the owners, was amazingly helpful and kind throughout our stay. When we were shown to our room, we were amazed at the view. They have under 10 rooms in the entire property, but you are close to many of the restaurants and attractions Montepulciano has to offer.
Driving around the town can be tough, but they offer you a parking permit a couple hundred feet away from the hotel. Try to pack light if you drive in, wheeling your luggage down cobblestone streets is tough!