How to list Custom Post Type on permalink

Hi,

I’m having problems getting my post to list a custom_post_type (apartment). When reading the apartment single post I get this permalink structure:

http://www.blog.com/apartments/my-apartment-title

But when I change the url to:

http://www.blog.com/apartments/

It gives me error 404.

On the post registration I use this code

function register_apartments ()
	{
		# Register post type apartment
		register_post_type
		(
			'apartment',
			array
			(
				'_builtin'            => false,
				'labels'              => array
				(
					'name'               => _x( 'Apartments', 'post type general name', MYSITE_ADMIN_TEXTDOMAIN ),
					'singular_name'      => _x( 'Apartment', 'post type singular name', MYSITE_ADMIN_TEXTDOMAIN ),
					'add_new'            => _x( 'Add New', 'apartment', MYSITE_ADMIN_TEXTDOMAIN ),
					'add_new_item'       => __( 'Add New Apartment', MYSITE_ADMIN_TEXTDOMAIN ),
					'edit_item'          => __( 'Edit Apartment', MYSITE_ADMIN_TEXTDOMAIN ),
					'new_item'           => __( 'New Apartment', MYSITE_ADMIN_TEXTDOMAIN ),
					'view_item'          => __( 'View Apartment', MYSITE_ADMIN_TEXTDOMAIN ),
					'search_items'       => __( 'Search Apartments', MYSITE_ADMIN_TEXTDOMAIN ),
					'not_found'          => __( 'No apartments found', MYSITE_ADMIN_TEXTDOMAIN ),
					'not_found_in_trash' => __( 'No apartments found in Trash', MYSITE_ADMIN_TEXTDOMAIN ),
					'parent_item_colon'  => ''
				),
				'description'         => __( 'Apartment description' ),
				'singular_label'      => __( 'Apartment', MYSITE_ADMIN_TEXTDOMAIN ),
				'capability_type'     => 'delete_published_posts',
				'menu_position'       => 3,
				'exclude_from_search' => false,
				'capability_type'     => 'post',
				'hierarchical'        => false,
				'public'              => true,
    			'publicly_queryable'  => true,
				'show_ui'             => true,
				'ep_mask' => 1,
				'rewrite'             => array ( 'slug' => 'apartments', 'with_front' => false ),
				'query_var'           => true,
				'taxonomies'          => array ( 'category' ),
				'supports'            => array ( 'title', 'editor', 'thumbnail', 'revisions' )//, 'excerpt', 'comments', 'custom-fields' )
			)
		);
}
add_action ( 'init', 'register_post_type'  );

Any help would be appreciated.
Thanks