I think the host is responsible. After all, you can't blame a guest for trouble with your property in this case. If I were the guest, that is how I would see it, and how I would act on it. My devices cost around $600 for the iPad and $600 for the iPhone. I would definitely want that reimbursed if they were damaged beyond reasonable repair. If they were repairable, I would expect the host to pay for this. I would definitely go to Airbnb and make sure this happened. If I had travel insurance as a guest and they were willing to cover it, all well and good, but if I didn't have insurance, I would work with Airbnb for compensation unless the host agreed to cough up the money first.