@Emma3026
Sorry to hear you experienced many problems with this guest. However, I'm a bit confused about some of the things in your post.
On your listing, you state that the guest pays for the electricity directly themselves via a couple of different methods.
"It is up to travelers to pay the personal electricity comsumption during the stay. You can refill the electricity depending on your comsumption (or we can assist you to do it) via Wave or Orange Money."
So, if the guest hadn't bought the units of electricity, how was it that they were able to use it? For sure, it's idiotic to leave the AC and lights on when checking out but, again, wasn't this electricity that he had already paid for as per the above methods? Why would you be charging him later via the Airbnb system if that is the case? Or, was it that there was already enough
Anyway, let's suppose that you are not using the methods of payment above, and only charging the guest for electricity after the stay, I am not sure that's a good idea because, as you have found out, Airbnb won't do anything to collect the money if the guest refuses to pay or they can't get hold of him/her.
Re leaving the place dirty, with trash on the floor, the listing says that you provide cleaning twice a week. So, did you not clean the place during his stay? Or, are you saying that he made this mess in the few days at the end of the stay and not before? If the listing is being cleaned twice weekly, then one would think it couldn't get too bad... But I guess some guests are very messy.
RE the review, I cannot see a review from this guest on the listing and of course you cannot see his review until you leave one yourself, or the 14 day deadline has passed. Do you already know he has left a review, i.e. So, did you get a notification about it and you are just anticipating that it will be bad and asking Airbnb in advance to remove it? They will not do that and will only remove a review if it violates their review/content policy (please read these for more information). So, you need to wait to read his review and then ask for it to be removed and state what it is in the review that breaks Airbnb's policies, otherwise they are just not going to do it. As you know, if they don't remove it, you still have the right to respond to it.
You are right that the host is not that well protected, but in this case, I can't see that there is much you can do, except to leave an honest review/ratings for the guest.