Let me start with the positive aspects - the location is indeed beautiful - the views of the mountains and the castle of Radicofani, the gardens with many fruit trees (fig, apple, pear), the delicious grapes on the vine, the enormous infinity pool which was large enough for us to swim short laps (although a little cold since due to the draught there was no hot spring water in the pool), and the house was more than big enough for a family of 5 with 3 young-adult children. The house was also cleaned once during our 9-night stay which was a nice bonus, and the pool was cleaned every day. The high-speed internet, which was very important for us, worked very well. Communication with the owner was very easy, via whatsapp, and he was always responsive to our questions. He gave us good directions and we took an easy hike down to the river (which was dry due to the draught), which I would recommend.
The negative aspects, most of which are easy to solve, are as follows: the furniture, especially the living room sofas, urgently need to be replaced. They were extremely uncomfortable to sit on and you could feel the springs. Likewise, most of the mattresses, except for one, need to be replaced. Finally, it would have been nice to have more amenities available (e.g., the owner only supplied one roll of toilet paper per bathroom so we had to buy more but now the next renters will have a better supply, no replacement garbage bags were supplied, etc.). Other houses that we have rented in Europe were better supplied.
The final point, that I think anyone who is renting should be aware of, is the road that you need to take to get to the house. From Celle Sul Rigo you must drive on a gravel road for 3 km, and the final km is a steep incline, with the final few meters before the house paved. We had rented a regular car, with which we were able to drive on the dirt road, but a jeep or 4-wheel drive would have made the ride much easier. Due to the steep dirt road, we were nervous about returning after dark, and always returned before sundown.
Despite the above, all in all we had a very pleasant and memorable stay.