I have been staying in Italian apartments for 25 years, during which time I have stayed in about 15 different apartments. This was not the worst I have stayed in, but it was not in the top 1/2 . The location in the historical centre is superb (we are used to climbing many stairs so that didn't bother us), and in many ways Mattia was helpful. He was there promptly for check-in, recommended fantastic restaurants we enjoyed greatly, kindly arranged a taxi when we left, and answered emails quickly. But his answers were disappointing. We had read reviews that noted a few problems with the flat, but when I mentioned some of them he seemed surprised. I would expect a "SuperHost" to read and respond to concerns. One complaint that I had noted was that the pots were broken with only one handle. I was surprised that they had not been replaced, and asked if there were any other pots. The prompt and polite answer was "No." Buying new pots is not expensive. There is one small pot with a handle you can use to heat up milk on the stove top (there is no microwave though the ad had said there was: Mattia said he has now corrected that) but the stove top is is also uneven so unless you hold onto it the pot will tip and spill all over everything. (I should note too that it is hard to get bad coffee in Italy, but the coffee supplied was ghastly; bring your own or go to the lovely cafe downstairs.) . The freezer door is also broken and falling off . There is a small, elevated living area with a couch. But there are no lights that work there and that part of the apartment is very dark at certain times of day so we couldn't sit there. at night or early morning I asked Mattia if there were a way to turn the lights on and the prompt answer was "No." It might be expensive to fix the lights, but a stand-up light would be cheap and helpful. Finally, a previous reviewer had noted that the bath is dangerous and it indeed is. It is a sitting half-bath and the floor is split over two levels. If you are small, you can probably find a way to stand safely to shower but for anyone tall or large it can be very difficult. You can't sit to have a bath either, as there is no plug. The previous reviewer had constructively suggested installing bar to hang on to. If that it is too expensive, at least a rubber bath mat to prevent slipping and a plug for anyone who wants to sit would help.
I understand that this is an old apartment, but the overall feeling we had was of a certain stinginess, as if the owners would not spend any money even on very simple and cheap things that might make visitors slightly more comfortable (some small spoons would also be nice!). It really would not take much money, effort, or imagination to improve things.