How to Add Taxonomy description or other field value in a textarea with WYSIWYG?
You have to add any wysiwyg module and enable it. Follow the installation instruction on your site (/admin/config/content/wysiwyg). You can use a wysiwyg editor like ckeditor. Then on same configuration page, for Filtered HTML select your editor.

Once an editor is set for a particular text format. You can follow these steps:


Add a Vocabulary to your taxonomy like Hotel Properties (hotel_properties). Edit it and add new fields to it like price.
Now in your content type, you can use Hotel Properties (hotel_properties) as term reference and widget type: autocomplete.
Now you can alter the node tpl or use panels (Node Template) to display information from taxonomy.


Note: To get the wysiwyg editor, use filtered text editor.