@Anthony1095 No, sorry, I don't think it should be standardized. There are all sorts of accommodations offered on Airbnb, and guests are free to choose one that meets their needs. It should evident from the listing information, including the amenities list, the photos and the reviews, in addition to your ability to message the host and ask questions before committing to a booking, as to what to expect.
Surely the place with the bunk beds and one shared bathroom for 9 people was eveident that it was so from the listing? If not, that's a failure of accuracy on the host's part and you should mark them down for accuracy. If the listing was accurate, why did you book it if you didn't want to live in that type of hostel situation?
I would venture a guess that you are booking on the basis of price, choosing unexpensive listings. As in most walks of life, you get what you pay for.
I agree that 9 people sharing a bathroom is a bit much and may even violate local accomodation laws. And there is nothing wrong with some friendly feedback to a host about what, as a guest, you feel they might do to make their place better. But guests also make the most absurd suggestions to hosts, such as adding another bathroom- in the place you mentioned, I agree that she should either not try to host so many people at once, or add some bathroom facilities, but in most cases, what this would amount to is a guest who's paid $25/night suggesting to a host that they spend thousands of dollars on some major remodel of their home. Which is ridiculous, and not in the same league as suggesting they provide guests with a bedside lamp or a desk and a chair.
There are entire threads here on the forum with the most ridiculous suggestions hosts have ever had from their guests. There's some real doozies.
In the future, I'd suggest that you book places that provide the amenities you would like, rather than being disappointed that there weren't things that were never offered in the first place. There are plenty of listings that provide guests with dressers, closets and hangars, desks and chairs, cable TV, and anything else you deem necessary for a good stay. For which you might have to pay a little more than you have been.
Booking an Airbnb isn't much different than booking a hotel in what you can expect. Book a Motel 6 room and you aren't going to get the same amenities as you would if you booked a room at the Four Seasons. If the hotel industry insisted that Motel 6's had the same level of service and amenities as the Four Seasons, you'd never have the option of a cheap motel room.