AR is something that I would love to see for myself!
For this particular scenario though, I've found that both hosts and guests responded far better to simplicity: a familiar UX (images/text) with a nice UI. Now that AI has become mainstream, adding this to search was also received well. Funnily enough, most of the past six months was spent culling features and streamlining/abstracting choices. The AI actually started out as multimodal and was reduced to text-only over time.
What I've learned from users is that a guidebook is non-critical until it is. When a guest can't figure out how the microwave works, they don't want to download an app, learn a new behaviour, and so on. They just want an answer as quickly as possible - from the host, or from a simple guidebook.
It's not so different from the host's perspective. Their focus is hosting, not creating the perfect resource. I added templates and "AI onboarding" (i.e. write a prompt / dump existing info as unstructured text) which people seemed to like. Turns out blank canvas syndrome is very real here as well. The AI organises existing info, creates placeholders for what's missing, and adds suggestions of what could be included.
When the guidebook fails to answer a question, it's logged so that the host can update it directly from the UI.
Completely agree with translation - it's on the list!