I managed to solve it with the following code.
$term_id = get_queried_object()->term_id;
$post_id = 'product_cat_'.$term_id;
$post_object = get_field('showsite_location', $post_id);
if( $post_object ):
$post = $post_object ;
setup_postdata($post); ?>
<? echo get_the_post_thumbnail($post,'thumbnail');?>
<a href="<?php echo get_permalink($post); ?>" title="<? echo get_the_title($post);?>">How to find us</a>
<?php wp_reset_postdata(); // IMPORTANT - reset the $post object so the rest of the page works correctly ?>
<?php endif; ?>
