This is by far the worst experience with Airbnb. When arriving at the apartment it was dirty, there was dust and hair everywhere and lots of mold in the bathroom wall. This apartment has two AC-s, one downstairs in the kitchen and another upstairs in the bedroom. After turning the bedroom AC on we smelt plastic burning smell after which we turned it off. The whole apartment smelled like burned plastic, and had toxic fumes because of the AC. It was impossible to sleep in the bedroom, because the upstairs bedroom has no windows (to let burn smell out), so we opened the living room sofa. It was very small and uncomfortable.
Apart from that, toilet bowl did not hold water and water was running all the time non-stop, it was so loud that we managed to get only 3 hours of sleep during our first night.

We arrived in the apartment midnight and after our finding with the AC, plastic burning smell and toilet water noise, we decided to contact Airbnb straight away, unfortunately they did not do anything at first. The next day we also contacted the host and he was very aggressive, calling us liars and scammers, yelled during the phone call, he also said that he himself went to the apartment the same day that we arrived and everything was perfect.
We wanted our money back for the first night, but he did not agree to give us any money back, because I quote "You already stayed in there, I have apartment costs that I need to pay for".
We called Airbnb again and the people we spoke with were again incompetent in invoking "Travel Issue" which is meant for exactly this kind of situations.
The host sent a repair man to the apartment, who was very nice and helpful, but could not solve the issues right there, but he at least confirmed to the host that we are not scammers and the problems are real. After second night sleeping on the sofa I called the host again, saying that we want some kind of refund because now it is confirmed that the apartment had problems, and a discount should be in order. Mind you we payed over 200 euros for the 2 nights on a small sofa, no AC in bedroom and burnt plastic smell everywhere in the hottest week in Italy and the host only agreed with 20 euro discount, when I tried to get it to 50, he disagreed.
Lucky for us a competent Airbnb worker picked up our case the same morning and we managed to leave after spending 2 nights in this apartment.
In conclusion, I don't recommend it, it's overpriced, dirty and the hosts are aggressive, not taking any responsibility for the state of their apartment and do not want to return money for the bad experience. All they care is that if you stayed in their apartment, you must pay, no matter what.