BWO Option 2
The option 2 is using JavaScript and you can integrate it with the following code:
<script src="https://test.bookworldhostels.com/bwh_widget.php?hostel=test&agent=HomePage&lang=de&boilerplate=no" type="text/javascript"></script>
About the parameters see the page parameters
You can find an example on this page:
https://test.bookworldhostels.com/bwo_widget_test.php
The example CSS you find here:
https://test.bookworldhostels.com/bwh_css/bwh_widget_test.css