The guest may be entitled to a partial refund depending on the circumstances of the breakdown.
If the breakdown was caused by the guest
The guest will not be reimbursed for any unused days and will be responsible for both the cost of repairs and the costs incurred by the host to retrieve their RV.
If the breakdown was not caused by the guest
The guest will be reimbursed for the unused days as per section 4.3 of the terms of service.