Kia Ora Manami,
Thank you for contacting the Kiwi Experience team.
Once you are on the bus you will be able to book your accommodation through your driver guide. This is guaranteed at each overnight location for your first night, except Franz Josef we guarantee 2 nights and in Queenstown we guarantee 3 nights.
Your guaranteed accommodation will cost between $26-$33 per night. We have recommended accommodations in each location. In Nelson for example we stay in Custom House Backpackers this is your guaranteed accommodation. We pickup up from Tasman Bay Backpackers aswell so if you want to book this yourself, then all good.
If you do decide to book your own accommodation along the route, a recommendation I would make is try booking accommodation that is close to our main/central pickups this will make sure it is more convenient for you regarding pickup. I have attached a link below with our main pickups.