Change features/amenities icon

Hello,

I would like to change the amenities icons. How can I add a specific icon to a specific amenity?
In template file I found <?php echo $row->amens_str1;?> but this shows all of the amenities, is there maybe a deeper variable? Something like <?php echo $row->amens_str1->value;?> so that I could check the value and output it directly in template one by one so that I can attach a specific class to it?

See the attached wanna be sample of how I am trying to do.
Best,
Davor