I am new to hosting on Airbnb this year. We had a guest stay at our cottage and a window on our front porch was broken. They said it was that way when they arrived, however I had just been at the cottage cleaning a few hours prior for their arrival. Also, they did not notify us until the next morning. The windows were closed when I left and it looks like when they tried to open it slammed back and cracked the glass. I can not prove that they did it because there were about 4 hours between my departure and their arrival, but the screen on the outside was not broken and the wind did not blow it in because it would have shattered...and it was not. Is this something I could bill to them for damage to the house and should I since they are saying they did not do it? HELP