Hi czimek,
You can use fontawesome to change icons to desired icons.
The list of icons you can find at (in case you are using style-1):
kensington/assets/css/style-1/style.css go to line 5077.
http://prntscr.com/kz765r
Scroll down and you will find icon list codes, something like this:
http://prntscr.com/kz76e5
Then you can change the icon by replacing the icon code, go to kensington/template-parts/property-main.php and go to line 80.
For example, if you want to change bedroom icon to home icon, change the html code to be like this:
http://prntscr.com/kz7844
Change from fi flaticon-room to fa fa-home, and the result will be like this:
http://prntscr.com/kz7bx4