I really hope this doesn't become a thing. This city (Bombay, India) is infested with rats. They occasionally get in here, usually via the balcony garden. The rest of the house is pretty much closed up. Once they get in, they're hard to get rid of. Historically, we set traps, but it often takes them a while to go in there, or they don't go in at all. Since we've been having guests, I've been getting a bit more aggressive about it, and putting out poison. One problem with poison is that they are then prone to die in inconvenient places, often in plain view.
I was thinking of trying to mouseproof/ratproof the building (we're on the second floor). Apparently they climb on the pipes, and you can put physical obstacles in the way - there's a funnel thing one can put on. But I was advised (plausibly) by our plumber (who's a good guy) that it was a waste of time. The building is very large and is connected to the two buildings on either side in complicated ways, there are annexes built on - it's a nightmare. So you'd have to mouseproof/ratproof all three buildings, it would be a huge project. And he said rats/mice can also climb trees, and there are also trees overhanging those buildings.
Anyway, a few months ago, a guest from Barcelona, Spain sent me an email saying something like "I just saw a huge rat". Luckily he didn't take it any further. It sounds like if he'd reported it to Airbnb he would have got a free trip, or at the very least, a substantial discount.
More recently, a rat got into the garden, but I think it had already been poisoned, and died in the garden, I was told. I don't know if the guests at that time saw anything, but they didn't say anything.
This hosting gig is full of thorns, isn't it? It's a wonder any of us make any money on it at all.