@Francesca945 This amount varies. On average the hosts that I've stayed with have a $100-250 USD security deposit. I, as a host, have a $100 security deposit requirement for guests. However, in all my years hosting I have never had to deduct a portion from any past stay. If you have exceptionally valuable flooring, antique furniture, appliances, etc. perhaps a higher deposit is justifiable. Otherwise, a simple one within the $100-250 USD range will do.