Hi Angelique,
This all comes down to if you are worried about a bad review or not. If you are then I advice you pull through by accepting their demands. If not, stand your ground by communicating with them. Let them know why you are going to charge them as you've wrote it down here. Ultimately, give them an honest review and the end of this and if they write a false review, challenge it.
After this booking, go back to your listing and bold out, No Washing and Dryers on site. I would buy an extra iron just for the listing, there are some things that should be provided for guest at no charge.
As for the air conditioner, if you are going to charge extra for its use, put that in your listing and charge it through there. Limit extra charges via cash as much as possible unless both parties agree to it.
As a guest myself, I think its weird to pay to use an AC but as a host I understand you need to cover the bill. So just add the difference in the booking without specifically stating AC use.
Overall, full proof your listing as a means to cover yourself so incase you get the occasional guest who didn't read it, you won't at fault.