Hi,
The parts component/hikashop and ?Itemid=0 comes from the fact that you didn't enter any menu item id in the correspoding setting of your filtering module.
The product/listing part is necessary but can be simplified as well. Specially with the Itemid being set to a products listing menu item, it will normally be removed automatically.
For the filters, not much can be done. The parameters are necessary for the filtering system to work properly in all the cases.
That's why by default we don't activate the filter parameters in the URLs as it can get messy if you have a lot of filters, pagination, etc.