@Paige12 I don't think anyone has yet explained to you that the overall rating is NOT an average of the subcategories. It's a category of its own. So it's possible for a guest to give straight 5s in the categories but still assign a 1 for the overall stay. That's apparently what happened here. Did you review the guest positively? If so, you can ask Airbnb to remove your review of that guest. Sometimes that's our only recourse when we're blindsided by a negative or retaliatory review.
Also, I don't quite understand having the guest sign a statement when checking in that they accept the place in as-is condition. I mean I do understand the contract, but I don't understand the vibe or the reason behind it. It seems to say that you've had a lot of experience with guests or renters finding less than satisfactory conditions. So you've learned to have them sign this thing in case they find something that displeases them. There isn't anything strictly wrong with that. I assume it's clearly stated in your listing:
5.2 Contracting with Guests. When you accept a booking request, or receive a booking confirmation through the Airbnb Platform, you are entering into a contract directly with the Guest, and are responsible for delivering your Host Service under the terms and at the price specified in your Listing. ... Any terms, policies or conditions that you include in any supplemental contract with Guests must: (i) be consistent with these Terms, our Policies, and the information provided in your Listing, and (ii) be prominently disclosed in your Listing description.
And that the condition of the place is accurate and in line with the listing description:
6.1 Creating and Managing Your Listing. You are responsible for keeping your Listing information (including calendar availability) and content (like photos) up-to-date and accurate at all times.
If the guest finds conditions that were not disclosed in your listing description, they can use those conditions as the basis for a demand for refund or a bad review, and the thing you have them sign won't supersede the Airbnb terms.