Adding Parameters to get_comment

My point is: show posts last commenter name and comment date d F H:i
together. Any suggestions?

I think what you want is:

$defaults = array(
    'post_id' => $post->ID,
    'number' => '1',
    'orderby' => 'comment_date_gmt ', // default value; not really necessary
    'order' => 'DESC',
    'status' => 'approved',
);

You shouldn’t need to run get_comments() twice.

$defaults = array(
    'post_id' => 120,
    'number' => '1',
    'orderby' => 'comment_date_gmt ', // default value; not really necessary
    'order' => 'DESC',
    'status' => 'approved',
);
$comments = get_comments($defaults);
if (!empty($comments[0])) {
  $comments = $comments[0];
  comment_author($comments->comment_ID);
  comment_date('d F H:i', $comments->comment_ID);
}