This is a beautiful and spacious place in the middle of town - right next to the Mercato Centrale and within very easy walking distance of all sights. The hosts are extremely good at communication and very quick to respond. They were also really helpful in letting us into the flat long before the normal time.
Overall we had an extremely comfortable stay and I would highly recommend it.
One thing to bear in mind is that this is right in the middle of town and not the most quiet place in the world with market stalls downstairs and restaurants across the square. It didn't really bother us though and with windows closed it's no big deal at all.