All three of your listings are beautifully designed and appointed, @Gill101 ! I doubt that there are any problems with the listing. However, perhaps the twin room preference is more indicative of the type of visitor or visitor party for your area and you might want to capitalize on that.
What if you had fourth and fifth listings that are a combination of two rooms, i.e., king bedroom plus twin room and king room with queen room? These listings will be for parties of 2, 3, or 4 related or unrelated guests. It would good for 2 couples or parents with older children or 2 singles that like more space. Of course you would have to figure out the pricing but I think if you have a base price a bit higher than your single room price for 2 guests and then have an extra guest fee for the 3rd and 4th guest.
Just thinking outside the box!