I have this EXACT issue you have. I price my place accordingly--I live in a REALLY nice neighborhood but my house is old. I decided not to furnish my space Four Seasons nice becuase regardless I knew my place was so old people would have a hard time getting past it and to break even if I had nice furnishings I'd have to charge well over $100 a night, which nobody would pay. I actually have been Superhost but as the year has gone on, I am finding people's expectations are just simply ridiculous. My space is clean, it has it's own sepreate entrance and private bath--really nice and the price is way below even crap up the road....but still, I get lots of four stars and even a few three stars. People even say things that are not true as a reason to give me low ratings--just got a review the mini fridge has mold...yeah, it definately does not--it is squeaky clean. People complain it's not good enough yet they literally check in and don't leave...they RARELY leave and my space is in Las Vegas, so you'd think people would just sleep,shower, then leave to see the sights but that is not the case. It's three star worthy to guests but yet they are comfortable enough to literally check in and not leave--so it makes no sense to me. The other thing that gets me is when someone has a complaint or issue, they don't contact me. You'd think if the fridge was moldy or there were ants all over, they'd call me and scream "I CAN'T PUT FOOD IN THE FRIDGE BECAUSE IT'S SO MOLDY" Or if the guest leaves trash in the basket over night and wakes up to ants he'd call screaming, "I NEED SOME RAID...THERE ARE ANTS ALL OVER THE ROOM." Yeah, doesn't happen.
Airbnb is for the budget traveller. Plain and simple. The guest wants as much as they can get for as very little as possible. What feeds in to this is hosts who will do anything to get that Superhost status--hosts who provide 500 thread count sheets and rehab their spaces but charge less than they should just to get a booking. It isn't a level playing field. Guests can't afford a fancy casino so they book my place but what doesn't make sense is they are not using the mentality that my space is just a room in my house, it's not the fancy hotel they couldn't afford--they feel that because Airbnb is marketing our spaces as hotel-replacements that I should be as nice or nicer as a five star hotel, which that isn't comparing apples to apples. It makes no sesnse.
So----you're getting paid regardless. Let them leave a 4 star review. Who cares. Superhost makes no difference. From my experience--and I"ve hosted over 142 bookings since February so I consider myself kind of an expert, most people book based on price and location. If they want Four Seasons luxury, sorry--they aren't getting it for the price you and I charge and they can just--well....go to you-know-where. We are still getting paid for the booking and we still provided a space exactly as we have stated. I have never said my space is something it isn't and I can't really get upset if a guest either didn't read my listing and can see it's exactly what it is for the price or they just feel they are entitled to a night at the Ritz even though they cannot even afford a meal at Applebee's after they check in to my space.
It is tiresome. Really, really tireseome. However, it is what it is. I don't want to make renting a single room out of my house a full time job and ultimately I have to break even on it or it doesn't make any sense for me to continue. I"m not badmouthing guests, I"m just saying I find Airbnb guests to have a few things in common and as long as my effort is exactly as I state in my listing and I stay true to providing what I say I do in my listing, I have no issue with getting four star reviews.