Holiday Damage Deposits

Hi everyone!

I'm here today to canvass opinion. We own a holiday cottage which we've furnished to what we believe a high standard, and have successfully rented it out for the last 2 years. Unfortunately over that time, we've had some what we consider to be unacceptable damage done, for example the clawfoot bath being moved on two occasions causing a flood in the room below including damage to the electrics. A burnt rug where someone thought it a good idea to remove smoking logs from the fire and attempt to take them outside, and most recently a cigarette hole burned through an expensive duvet cover and duvet, when smoking in the house is strictly prohibited and ashtrays are provided for outside use. Obviously we accept that accidents happen, and don't charge for the odd broken glass or whatever, but we do feel that this sort of damage shows a total lack of respect, and are seriously considering requesting a 'damage deposit' which will obviously be returned provided that no major damage is done. However, the company who market the property for us state that this will put people off of booking.

My question therefore is - would you be put off if asked for a deposit, and if not, how much do you think is reasonable?

I'd be really grateful for as much input as possible, so thanks in anticipation