I arrived at that apartment and, hours later, I found out I was positive in covid-19. I alerted one of the employees (the co-host) and he was really nice and comprehensive with my situation. Hours later, the host communicated with me by whatsapp telling me that I had to leave the apartment and not warn the covid authorities about my presence there, because he didn't want to get his airbnb to be in quarantine. I told him that I had my reserve for three more days and if I could stay. The other employee helped me to find a new location to stay and I'm really thankful about it. At the following day, that worker found out he was positive also in covid-19 and he didn't alert the other people living in the airbnb.
Finally, I left the apartment one day before my reservation expired and I asked the host to refund me the night that I didn't spend there, but he didn't want to do so, because he said that I was the one who transmited the covid to his worker and to other workers. That is impossible, because I didn't have any contact without my mask with anyone and his worker did positive at the following day of my arrival, so it is impossible that I had transmited it. Also, that worker didn't alert the other people inmediately, but he lated for two days to tell it.
The host never got worried about my health condition and didn't help me with my situation. He just cared about not getting closed his apartment.