Custom template for view with block display in a page
The correct naming is:

views-view--applications--block-1.html.twig

Also, the custom template should be based on the views-view.html.twig template, rather than on the views-view-unformatted.html.twig template.

The following are the possible template names sorted by precedence:

[base template name]--[view machine name]--[view display id].html.twig

[base template name]--[view machine name]--[view display type].html.twig

[base template name]--[view display type].html.twig

[base template name]--[view machine name].html.twig

[base template name].html.twig


(Source: http://redcrackle.com/blog/drupal-8/theme-views-templates)