Apache is not serving css & js files when started by user

I've strange problem!

When I'm running my application using system installation of Apache2 and put files into directory /var/www/ all related .css and .js files are found by Apache process and served to user throught web browser.

Website tree looks that:

 /var/www/
    index.html
        /css
            *.css 

But... When I moved these data to /home/_user/www-data directory and start apache2 instance on my account with extra prepared file apache.conf with DocumentRoot pointed to /home/_user/www-data where files structure looks that same as original it can't find any *.css or *.js files!

 /home/_user/www-data
    index.html
        /css
            *.css 

Starting apache using command:

/usr/sbin/apache2 -f /home/_user/apache.conf

Part of HTML:

<link rel="icon" href=".glocal/ikona.png">

<!-- Custom styles for this template -->
<link href="local/dashboard.css" rel="stylesheet">

<script src="local/assets/js/ie-emulation-modes-warning.js"></script>
<link href="local/select2.min.css" rel="stylesheet" />