The module extends the Views Fields display, so you can still assign fields and alter them using standard Views options: links, labels, booleans etc. The resulting template will have a $content variable available that contains an object with the mapped fields by field name.
Template function
Views resolves which template to use via theme hooks. This module adds 1 theme hook that starts with custom_template__. You don't include that part in the Template function field. The template file will have to include that part though: