@Branka-and-Silvia0 The thing is, this guest didn't get sick with Covid after she arrived. She booked the place to take care of her Covid-sick parents and didn't disclose this to the host. That's just really disrespectful.
You wearing a mask when you first go in does definitely protect you. It doesn't have to be direct contact with an infected person- their breath vapor can hang in the air for hours after they vacate. That is dangerous, but the surfaces, not much, because it isn't absorbed through your skin- you have to breathe it in. So you'd have to touch a surface the infected person recently left virus particles on, then touch your nose or mouth and breathe it in.