I feel like to start with it would be nice to have people enter in the total # of guests 13+, total # of children 0-2, and total # of children 3-12.
-Some people feel their property isn't great for children. If people started marking children in their party, then that would provide the system a chance to automatically warn the guest "hey, this host has stated their property is not appropriate for 0-2 year old children" or something like that.
-It would be nice to charge different rates for extra child guests vs. extra adult guests. This could become unneccessarily complicated, but as a parent I understand why a person wouldn't count their 1 year old as a guest in the current system - the child will probably shower or bathe with the parent or a sibling, sleep in bedding they have provided, won't eat anything to speak of, etc - in short, that kiddo doesn't really cost much extra to bring along - just as airlines don't charge for lap babies. Different hosts may have different opinions on this matter, but it would be nice to be able to differentiate and have separate xtra guest charges for different age groups.
-My setup would probably be a little crowded for five unrelated adults, but it would be perfectly fine for four. However a family of 6 would probably be quite comfortable. Since I have on instant booking, it's possible for 5 adults to book, but what I really mean is "hey, family of 5, go ahead and book" not "hey, 5 college buddies, come flop on mattresses in the basement". I would like to be able to setup my max # of guests to be 6, with no more than 4 13+ in the party.