the location and location alone makes it worth it, if you like being within walking distance of everything. the space is large with nice views, but it is incredibly loud at night.
the AC did not work the first night at all, and there was only one fan. it was so hot it was making my mom sick (she is a senior citizen with some minor, manageable health issues). i spent all night trying to find another place to stay and everything was sold out, so we had to stay. the next day maintenance came, of which my father instructed him on how to clean the air filters as there was likely blockage and safety features that shut off air when they are full. this was the problem, after my father had to aid in cleaning absolutely disgusting filters. however, as two rooms are lofts and not rooms, the small ac units don't help at all. we had to request additional fans.
we had to clean the dryer which was packed with someone else's lint (or several other renters lint?) and the water container was also completely full, for who knows how long. so gross this was not handled by maintenance and/or cleaning crew.
the check-in window was 3-6, and as the trains were striking, we had to get a rental car to drive to Florence from Rome. By that time, it was 7 pm. we had to pay Halldis' staff $20 euros to let us in at 7 pm by no fault of our own which is frustrating and almost comes off as extortion.
this place has potential to be so so nice, but the lack of maintenance makes it frustrating. you're basically paying for proximity to the duomo.