You can use template variables along with fixed text to customize the display of each booking.
You can truncate the display if required. The truncation will start where you add the template variable:
[MAXCHAR:xx] - replace xx with the number of characters
[MAXCHARPERDAY:xx] - will truncate to these many characters per day, replace xx with the number of characters
[UNITID] - ID of the unit (number)
[UNITNAME] - unit names of all the assigned room types
[QTY] - shows quantity of units booked