from page.php

<?php if ( is_page('zapiski-moniki') ) {
query_posts($query_string . '&cat=3');
}<?php get_header(); ?>

    <?php if (weaver_is_checked_page_opt('ttw_hide_sidebars')) echo("<div id=\"container\" class=\"one-column container-page\">\n");
    else echo("<div id=\"container\" class=\"container-page\">\n");

    get_template_part('pgtpl','container');
?>
    </div><!-- #container -->
<?php if (!weaver_is_checked_page_opt('ttw_hide_sidebars')) get_sidebar(); ?>
<?php get_footer(); ?>

and index.php that works (except for is_page bit):

<?php if ( is_home() ) {
query_posts($query_string . '&cat=-3');
}
?><?php if ( is_page('zapiski-moniki') ) {
query_posts($query_string . '&cat=3');
}
?><?php
/**
 * The main template file.
 *
 * This is the most generic template file in a WordPress theme
 * and one of the two required files for a theme (the other being style.css).
 * It is used to display a page when nothing more specific matches a query.
 * E.g., it puts together the home page when no home.php file exists.
 * Learn more: http://codex.wordpress.org/Template_Hierarchy
 *
 */
?>
<?php get_header(); ?>
    <div id="container" class="container-index-loop">
    <?php
    weaver_put_wvr_widgetarea('sitewide-top-widget-area','ttw-site-top-widget');
    weaver_put_wvr_widgetarea('top-widget-area','ttw-top-widget','ttw_hide_widg_posts');
    weaver_put_perpage_widgetarea();
    ?>
        <div id="content" role="main">
        <?php
        /* Run the loop to output the posts.
         * If you want to overload this in a child theme then include a file
         * called loop-index.php and that will be used instead.
         */
        get_template_part( 'loop', 'index' );
        ?>
    </div><!-- #content -->
        <?php weaver_put_wvr_widgetarea('bottom-widget-area','ttw-bot-widget','ttw_hide_widg_posts'); ?>
    <?php weaver_put_wvr_widgetarea('sitewide-bottom-widget-area','ttw-site-bot-widget'); ?>
        </div><!-- #container -->

<?php get_sidebar(); ?>
<?php get_footer(); ?>