I am kind of free-wheeling here, just thinking of myself as a traveler that is choosing your place.
I wonder if it would be beneficial to rebrand this as two separate bookable locations? I am new to airbnb too, but I have a family. When we are traveling, we do it as a group of five people. Large groups of people are often a combination of big and little people. You have stated your town is small, so unless your town is where I am headed for my family reunion or something, as a parent I am thinking of your place as a throughway, and if I am on a budget I am trying to keep things cheap. It's very easy for me to find a single room for maybe $40 but for sure less than $100 and have some of my kids sleep on the floor or an air mattress etc when we are just trying to find some place to crash into bed at 11 at night and wake up at 6am the next morning. So even though I am "5 guests", in reality I am considering all places that are designed for 2 guests and above because my 5 year old can squeeze in the bed with us, and the older sisters can sleep in a sleeping bag on the floor.
In this scenario the kitchen/extra half bath etc are amenities we just wouldn't be willing to pay for because we're really just stopping through for a night of sleep. Features I am willing to pay the most for are the private entrance (because we'll be showing up late), a few extra towels, and access to the interstate/whichever road I'm driving to continue on my journey. However, if you branded this as two separate listings, maybe call one of them a private room with private bath, and one a private room with shared bath just to see which fairs better, then maybe you could at least get your first listings and start getting some reviews - I guess it doesn't hurt at any rate to try a few different things until you find the thing that sticks! For pricing, you could choose to charge extra, say $5 extra, for each guest beyond the first two in each room. I am just imagining that most people I know that travel in a larger group aren't willing to shell out for space unless they are going to be camping out somewhere for a long period - say a beach vacation where it's economical to cook your own meals and nice to be able to do laundry. That's when those additional features really start to matter to the potential guest. On the other hand, I was looking for a bargain in Laramie, WY last week and chose to stay with my daughter in a single rented room with a shared bathroom. It was $41, and we were really happy with it. The other guest down there was also a single traveler and very nice. If you switch over to more of a shared space idea, features you could highlight would be like a lock on the interior door of each room, and maybe something that emphasizes what a quiet place it is.
Also, you are south of the next major city to you, so an appealing tactic for me would be to highlight how convenient it is to get through all that traffic (for people headed south anyway) so you can wake up and hit an open road without delays. I know when I am driving from Oklahoma to Idaho, I always aim to get far beyond Denver so I don't have to deal with the traffic in the morning.