This was our first ever experience with AirBnB and that too in a different country (we live in the US), so a bit difficult to make relative judgements. So will mostly present the facts.
Marie communicates very promptly. She was at the property to walk us through. The property is centrally located and we could walk to Duomo in few minutes. One can easily walk from station to the property. The property is nice, clean, and bright and ample space for our family of 4.
The water pressure in the shower was relatively quite weak, then I was told that was the norm.
Our family likes to be constantly connected (i had to take care of some work stuff), but the internet connection was quite flaky. Marie was quite helpful in getting a different device that worked very well - but only for some time. Not sure if the flaky broadband is issue with city in general.
We were on an extended trip to Italy with Firenze being the first stop. The washing unit at the property came in quite handy to get clothes cleaned for the next legs.
The AC unit is located in the hallway and the location is such that one of the bedrooms does not get much of the airflow.
We noticed that during evening times lot of blue collar worker class folks would gather near property generally drinking and talking loudly. We didn't feel unsafe due to this but I would imagine some people may feel uncomfortable.
On the departing day, we needed to use the microwave, but it didn't function.
One thing to keep in mind: the unit is in the 3rd floor with no elevator access. So be ready to put in some work if you are traveling heavy. In our case, it was a good training for us as our stay at Rome required us to go up five floors.
All in all it was a good experience for us.