Display multiple post into shortcode

this my function shortcode

function sunshine_slide ( $atts, $content ) {
	extract ( shortcode_atts( array (
				'link'	=> get_site_url(),
				'open'	=> 0,
	), $atts ));

	$args = array (
		'post_type' => 'room',
		'posts_per_page' => 1,
	);

	$room = get_posts($args);

	$retval = '<div class="row">';
	for($i=0;$i<sizeof($room);$i++) {
		$retval .= '<div class="span8"><div class="callbacks_container"><ul class="rslides pic_slider">';

		$thumb = get_the_post_thumbnail($room[$i]->ID,'full');

		/* if (class_exists('MultiPostThumbnails')) :
		MultiPostThumbnails::the_post_thumbnail(get_post_type($room[$i]), 'image-2'); endif;
		*/

		$retval .= '<li>'.$thumb.'</li>';

		$retval .= '</ul></div></div>';
		$retval .= '<div class="span4"><div class="room-description">'.$room[$i]->post_content.'</div>';
		$retval .= '<div class="row list-features"><h4 class="span4">Features</h4><ul class="room-features">';

		$categories = get_the_terms( $room[$i]->ID, 'room_categories' );
		foreach ( $categories as $term) {
			$cat = $term->name;
			$retval .= '<li class="span2"><i class="icon-check-sign"></i>'.$cat.'</li>';
		}

		$retval .= '</ul></div>';
		$retval .= '<h4>Price</h4><div class="row"><div class="span2">';

		$price = get_post_meta($room[$i]->ID, 'Price', true);

                $retval .= '<div class="price-info"><span class="price">'.$price.'</span> / night</div></div>';
		$retval .= '<div class="span2 text-right"><a href="#" class="btn btn-primary">Book This Room</a>';
                $retval .= '</div></div></div>';
	}
	$retval .= '</div>';
	return $retval;
}
add_shortcode ( 'slide', 'sunshine_slide');