My friend and I rented a flat in Barcelona to Bellart during the month of August 2021 and it was simply the worst experience we had on Airbnb since I created my account.
First of all, we agreed we would made the check-in at 1 pm the first day of our stay. When we arrived, the flat was sill dirty and we had to wait 5 hours until we could be in the flat. I don't find it professional at all. Then, while we paid the amount of the rent via the Airbnb platform, the woman with who we made the check-in asked us for more money arguing that there was a special tax to pay.
Then, as there was a special curfew in Barcelona, me and my friend decided sometimes not to go out and simply to stay in the flat. While we were just living and talking to each others, we were harassing by the apartment management to "stop the excessive noise". Since when just living in a flat is excessive noise? You cannot take the money to people to rent a flat and, on the other hand, ask them not to live in this flat. They harassed us by calling us many times, sending messages on mobiles and WhatsApp ask us to remain silent. Then, they threatened us to call the police and to take us out of the flat. I don't think it's a professional and a smart way to welcome people who payed you an important amount to rent a flat for the holidays.
So I would not advise people to rent a flat to Bellart except if you are out all the time during your stay and that you just want a flat to sleep in.