In response to the hot water, things happen. You told me of the issue at 10pm one evening, the next morning at 9.30am, my plumber was in there fixing it. You were already out so perhaps you came home after 24hours but I could not have fixed it quicker than I did. It is not a reoccurring issue in this flat but generally in all rented apartments, things happen.
As for the electricity fee, IT WAS NOT A SURPRISE FEE! I did not request this of you only as you checked out, that is a lie. I clearly told you about it before you reserved to check you were ok with this. Check your messages. The rude attitude and bad language I was met with when I came to retrieve the key and this fee, was surprising.
Claiming money for the towels is not unreasonable. Unfortunately bleach does not get rid of all stains and many items of linen have black oily marks all over them. Would you want to receive such towels even if I tell you I have washed them and bleached them but black and yellow stains remain? I had to replace them and as you are the ones who stained them so badly, why should I not claim the money. It is not relevant how much you paid for the rental, you paid the price that has been decided for the property. It does not give you the right to abuse equipment which then costs the owner unnecessary expenses. I have never encountered such an issue before. You mentioned cleaning the apartment (which by the way I don't insist on, just to leave it decent) but there were cigarette butts on the balcony, the floor was filthy, toilets unflushed... It all lacked respect.