Add these two lines where the report should appear:
<div id="clara-widget"
data-clara-partner="immoweb"
data-clara-listing="21731953"
data-clara-address="Rue des Drapiers 2, 1050 Ixelles"></div>
<script src="https://widget.clara.city/embed.js" async></script>
Reports are produced by the CLARA API and delivered as HTML and PDF. More at clara.city.