When ordering a photo book within Google Photos, the address is obviously stored in their website.
However, as it seems there is no option to delete an incorrect address. Or not even to edit an existing address.
In the order status it is stated directly below the address given:
To change shipping address follow instructions here.
However, it says nothing about deleting an address, instead:
To change shipping address after buying, cancel your order and buy the book again.
But no way to delete former addresses.
How to delete existing addresses then?