@Scott1358 You didn't ask for advice on your listing itself, but since Andrew brought it up, I took a look. I think you could bring your ratings up a lot by doing a few simple things.
The same issues come up again and again in the reviews guests leave. Inconsistent and poor Wifi, confusion about the 3rd bedroom being in another building, and that the rooms are smaller than was expected.
I would suggest you work on both your listing wording and your photo gallery.
While you do say the 3rd bedroom is in a separate outbuilding, it's unclear how far it is from the main building, and some of your guests didn't get it at all. I would address this situation much more clearly, and say someting like "The main house has 2 bedrooms, and there is a third bedroom in a separate small building xx ft. from the house. So this is an attractive situation for a family where maybe grandma and grandpa would like to retire to their own quiet space and go to sleep early, or the teenager might like some privacy where they can stay up late without disturbing others. Or for 2 couples travelling together so they each have a more private space. (Please note: if you are a family with younger children, this arrangement might not work for you, as if you need 3 bedrooms, someone would be sleeping in a different building.)
I would also be really clear about the Wifi situation. Most people just take high speed, constant, unlimited Wifi for granted these days, so you have to let them know that's not the case. And don't post the speed.
"While we do have Wifi, this is a remote property and the Wifi is neither reliable nor particularly fast. Nothing you can depend on. So if you absolutely need to work online while on your trip, this is probably not the right listing for you. On the other hand, if you like to be outdoors a lot, read, and relax, this is the right spot for that."
Not all listings have great Wifi, mine sure doesn't, but you need to make that known to guests in your listing.
Mentioning the possible cons of booking your listing, along with the positives, will dissuade guests who would complain about those things and leave poor reviews and ratings. You don't want to attract any and all guests, you want to attract those who are a good fit for what you offer.
And finally, your photos. I would redo all of them. The way you have taken them distorts the space, which is why you are getting so many mentions about the small rooms. I know it's hard to get a good photo of a small room, so don't try to fit it all in by taking the type of photos you have. Take a couple photos of each room from different angles, so the guests can get an accurate dea of the size and layout. Same for all your photos, really. And maybe try to get a shot of both the main house and the outbuilding, and use arrows and writing on the photo to make it clear how far it is from the main house, or include a site plan.
If you make these changes, I think you'll see your ratings go up. It isn't that you are doing anything wrong as a host, it's that you aren't describing things fully and clearly, so guest expectations aren't jiving with what they experience when they arrive.
And I'm not sure why you ask guests to wash the sheets for the next guests, but that's pretty odd. As a host, you need to be inspecting the linen and towels for stains or tears after guests leave, pre-treat stains, and make sure they are really clean for the next guests. That's not something to rely on your guests to do. And you've already had a legitimate comment about that- that she brought her own sheets because she wouldn't trust the previous guests to have washed them well. Which I wouldn't, either.