Hi @Denis168, I agree with @Matthew285 that you shouldn't have assumed the parking spot. It was best to contact your host to confirm the parking space.
Although most hosts have a house manual to assist the guests, it is not mandatory for the hosts to have this.
While booking it is necessary to have understood the house rules. If your host has mentioned the parking space, it would have been best to make a note of it.
I do understand, at times we don't get into the details especially when we are traveling in a hurry. I see there is a lack of communication on both sides here.
However it is not unreasonable to request your host to split the parking fee. Take it up politely and your host might be able to split it. But please remember that he is not obligated to do so, but will be doing it as a courtesy, it he agrees.
I hope you are able to resolve this issue in an amicable way. Pls don't go spoiling your travel over this!