<?php
// bootstrap
public function _initRoute(){
        $router = Zend_Controller_Front::getInstance()->getRouter();
        $route_test = new Zend_Controller_Router_Route(
        '/:id/:seo',
        array(
            'controller' => 'flats',
            'action' => 'view',
                    'id' => 0
        )
    );
    $router->addRoute('test', $route_test);
}

// Controller flats, view action
$id = $this->getRequest()->getParam('id');
?>

// View
<a href="<?php $this->url(array('id'=>'1', 'seo'=>'blabla.html'), 'test'); ?>">link</a>