I chose this flat because of the location and the stellar reviews, but unfortunately we found our stay to be overall pretty uncomfortable. I'll start by saying that communication with the hosts was excellent and when a door handle broke, they were really quick to fix it. So this has less to do with the hosts and more likely the reality of staying in an older building. We had a few issues with the flat itself:
* The bed was quite uncomfortable, we got some extra pillows which helped a lot
* The duomo bells - I'm not sure if a farther location would have helped but it was impossible to sleep past 6:30AM with those bells every morning, the view was amazing but being so close definitely had its downsides
* The wifi was really poor, which was particularly problematic for us since we were working from there for a few days
* The shower was not good - the pressure was very low and fluctuated between an okay temperature and scalding consistently
* We could hear the next door neighbors almost as if they were in the same flat, this wasn't an issue during the day but woke us up for a few nights
For a short stay I think this place could be fine if you don't mind waking up very early, but for our long stay we had a rough time with poor sleep and showers.