The location of this apartment is even better than you expect - the view of the Duomo is incredible, and you are right in the centre of the city! Cristina and her brother were amazing hosts, and Niccolò gave us so many great recommendations for places to go and eat drink in particular. The apartment was clean and comfortable and we had a very enjoyable stay.
One thing to note which is not made clear in the apartment description, however, is that the terrace is communal. We found it very uncomfortable coming back in the evening to over 25 people having drinks and gathering right outside our window at 11.30pm when we were ready to go to bed.
Being aware of this detail in advance is helpful for your stay, but you will have an amazing time regardless.