Translating a welcome book by hand means maintaining two documents that drift apart from the first correction onwards. Most hosts do it once, then quietly stop.
A host who translates by hand does it once, when the book is new and the enthusiasm is high. Then the code changes, a rule is added, the checkout time moves — and each of those edits happens in one language only. Six months later the English version describes a property that no longer exists, and the guest reading it is the one who trusts it most.
Nokbok turns arrival instructions, house rules and Wi-Fi details into one link — no app to install.