Hello Jeffrey,
The [mphb_availability_search] appears to be a general search shortcode, which allows to search through all the accommodations on the website. As for the [mphb_availability id=””] shortcode it is used for single accommodation type pages and allows to search for specific accommodation availability. However, if you enable “Skip search results page and enable direct booking from accommodation pages.” option and select the “Show price together with adults and children fields” radio button under Accommodation ->Settings tab, you will have a field for the number of guests displayed in the [mphb_availability id=””] search form as well.
Regards,
Andre