I normally don't charge if they change their mind quickly (i.e. within the first 5 minutes). Anyway, with most people who don't want to proceed, you can tell pretty quickly and I give them an easy out telling them they are free to go with no payment required as I don't want to be in the company of someone who doesn't really want to be with me.

But in this case, seeing that he messed you around by arriving 45 minutes early, seemed to be okay, took a shower and then changed his mind, I would have kept the fee.

I swear to god men love testing our patience LOL you did the right thing keeping the money

Cheeky bloody twat, you were right to keep the cash!

The towel was wet but are you sure he actually had a proper shower?  No matter if he did or not its likely that towel has some of his sweat/hair/arse crack yuk on it so your money is earned, you have to launder their towels! A strange scenario though all the same whether he bottled it or planned to walk anyway but thankfully you got your money first which is always very wise just in case of situations such as this.

In some public toilets I've been extortionately charged a pound or a euro to use their facilities....(and I wasn't in there knocking one out!)