Dear Tyler
This is a good idea. The guest or host can share photo in the Airbnb premises. I have travelled so many place and found photo frame or photo board next to reception area or common place for the guest like lobby or sitting area. Specially I found most of the hostels, clubs and boutique hotels.
You can create a board where you can past or clip the the guest photo or host experience photo with guest or any travel experience related picture. It will give some idea it will keep the past memories, how to make friend while traveling or which place should visit in this area.
Do something creative it will must accept by the community.
Thank you
Regards
Mizanur