This is the default user page. If you see this, it means your public_html is enabled.
To enable your apache user dir, you have make your home and public_html directory world readable.
You can do this by executing the "enable_html" command from the shell or in the usermin custom commands.
To disable it again, do the same except with "disable_html"
You can access your page by going to http://www.insomnia247.nl/~username