Here is the code;

Don’t forget change rss url on line 4.

<?php if(function_exists('fetch_feed')) {

	include_once(ABSPATH.WPINC.'/feed.php');
	$feed = fetch_feed('http://feeds.feedburner.com/catswhoblog');

	$limit = $feed->get_item_quantity(7); // specify number of items
	$items = $feed->get_items(0, $limit); // create an array of items

}
if ($limit == 0) echo '<div>The feed is either empty or unavailable.</div>';
else foreach ($items as $item) : ?>

<div>
	<a href="<?php echo $item->get_permalink(); ?>"
	  title="<?php echo $item->get_date('j F Y @ g:i a'); ?>">
		<?php echo $item->get_title(); ?>
	</a>
</div>
<div>
	<?php echo substr($item->get_description(), 0, 200); ?>
	<span>[...]</span>
</div>

<?php endforeach; ?>

This code shows RSS Feed with 200 chars description.

Here is the original post!