WiFi without internet - intentionally

Orbi systems work fine without an internet connection.  The obvious limitation, of course, is "no internet".

Otherwise, both wired and WiFi devices can communicate on a local area network.  Computers, media servers, file servers, printers, etc.  All good.

There was a fascinating post some years ago about a medical group that needed to set up a WiFi network out in the jungle. They had no internet access, but had dozens of computers, printers, servers, lab machines, etc. that needed to communicate with each other.  Too large a space for a single WiFi router to handle, so an Orbi mesh system was great.

It this short term rental is not a large area, then the Orbi WiFi router by itself might be perfect.