Follow these configuration to allow author add WooCommerce products into their listing
Edit listing type post to select WooCommerce Product for child post type option then click Save Changes
Add/edit product submit fields
Add Rooms field on listing submit/edit page
Then author can add/edit products for their listing
And to show products on single listing page. Edit listing type post -> Single tab -> Listing sub-tab to add WooCommerce Products element into layout builder.
And this is how products showing on listing page