Guests- I don't understand why there is so much confusion regarding partial payment/cancellations.
The partial payment option is simply provided as a convenience to guests so they don't have to come up with the full amount of the reservation all at once.
It is completely unrelated to the cancellation policy in place.
It says quite clearly, if you bother to fully read the cancellation policies, that they are based on the nightly rate of the accommodation.
If the full amount of the booking is $200, and you pay it all at once up front, and the cancellation policy is 50% refund, you will be refunded $100.
If that same booking is paid in 2 installments, and your first installment was $100, if you cancel, you will get nothing back, because you only paid for half the full amount in the first place.
The partial payment option is not some way to have the cancellation policy applied differently to you than to a guest who paid the the whole shot at once.
The cancellation policies are not based on what you paid, they are based on the total cost of your booking. And that is, in fact, clearly stated in the cancellation policy information.