Tiziana's apartment is very, very centrally located - essentially on the Duomo piazza. Convenient for the first time slot to climb the dome in the early morning! We found the apartment clean and comfortable for our week-long stay, and the neighborhood had everything we needed. All in all, a good find with good value. Tiziana was very responsive in our communications and we were also able to check-in slightly early which was nice.
A couple of tips: do read all of Tiziana's instructions for check-in - Google maps will take you to the wrong location a few blocks south of the actual building. Also, if you need it very dark and quiet to sleep, I would bring ear plugs and an eye mask since you are on a fairly busy street that's lit at night (it's not a big nightlife neighborhood, but the Duomo's bells might wake you up if you sleep in late).