@Mike-And-Jane0 Without seeing the listing, I have no idea how the offering was presented to the guests. If there were cleanliness issues with the linens and surfaces, and malfunctioning showers, those issues should have been reported to the host immediately and then to Airbnb if no resolution had been agreed upon within 24 hours. A £200 refund seems appropriate for the shower malfunction, but the host should have also replaced the soiled linens and organized an additional cleaning.
But @Emma2193 , when requesting help with a problem (whether to the host, to Airbnb, or to the online community) it really helps to be upfront and clear about what your ultimate objective is. The Guest Refund Policy would most likely apply on the basis of the aforementioned problems, but only under the condition that you terminate the booking and leave. If you decide to clean the property yourself and remain onsite, there's no provision entitling you to any kind of refund.
Communication is key here: these days, Airbnb's customer service operation seems to be skeleton crew, so it's imperative that hosts and guests work out their issues with each other directly as much as possible. Emma, just out of curiosity - how do the recent reviews describe the property? Airbnb isn't out there doing quality control on its listings, so usually the best indication you're going to get of whether a property is accurately described can be found in the reviews.