Is it common practice for the real estate agent to charge separate advertisement fees in addition to 110% letting fees?
This agent is trying to charge $500 for advertisement alone though there won't be any new new pictures taken or sign board outside the property.
What would be an appropriate fee to advertise only on the website (I think it would be put on both RealEstate and Domain at minimum)?
It depends on why you’ve agreed to is the short form answer to this question.
Each agent is different