Custom Fields – Boolean Display of True/False to Yes/No

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How about using a ternary operator?

    if ($immopress_property['assistedLiving']): ?>
        <li class="assistedLiving">
            <span class="attribute" style="width:200px;display:block;float:left;"><?php echo 'Seniorengerechtes Wohnen' ; ?><span class="wpp_colon">:</span></span>
            <span class="value"><?php echo get_post_meta($post->ID, 'assistedLiving' , true) ? 'Ja' : 'Nein'; ?>&nbsp;</span>
        </li>

        <?php wp_reset_query(); ?>
    <?php endif; ?>

Also, please, keep your presentation separate from your content by not using inline styles.