I don’t know about others, but I found it extremely difficult to get WPML working with the hotel booking plugin. Since rates, accommodations and accommodation types need (partial) translation, either the translated description appears and is it impossible to show search results. Or the search results show up but not the translated stuff. Is it the latest WP 5.x that changes things? Is it the plugin? Or is it the theme?
We have sent a reply in your request saying that rates needed to be duplicated using WPML functionality so save data about accommodation types used in the rates. Please check your email and find screenshots attached.