Only for bookings outside your current place of stay (incl. 5km radius) it is legitimate to demand reimbursement of travel costs. Please make sure that the travel expenses are passed on 1:1 and that you clarify the amount and the way of reimbursement in advance with your customer. This does not lead to misunderstandings. If you wish to waive the reimbursement of the travel costs, you are of course free to decide. You are your boss.