Why keep the arrangement here

The block is not there to make things hard for you. It protects what stays on the record.

An arrangement made off Peelpel is not a booking. No period is held, nothing records what was agreed, and there is nobody to turn to if the space is not free when you arrive.

The host loses too. An arrangement made by phone leaves no record of what was promised and no way to show that the space was really booked.

Keep the arrangement here until the booking is confirmed. After that you can pass on any detail you need.