We had a great stay at Barbara's place.
The location is great - around ten minutes walk to a number of different very beautiful piazze, as well as the fantastic piazza Duomo. Lots of free parking available nearby. Also a good location if you're into shopping.
Barbara was very accommodating, very good communication, friendly etc. We arrived at lunchtime and were greeted by a very friendly cleaner who allowed us to check in early.
The flat was spacious with a decent sized kitchen, definitely big enough for 2. All cooking equipment included. The bed was very comfortable, there was AC, fast WiFi.. The bathroom was very nice.
There was a bit of noise from the street as other reviews have suggested, but I definitely wouldn't say this is a deal-breaker.
Overall I would recommend staying at Barbaras place.