Bryan,
Welcome to Airbnb and I hope you enjoy hosting.
I have been with Airbnb just a little over a year. As a host it is a learn as you go experience for me. I make choices on what I'm willing to accept and what I don't
Most of the time I enjoy Hosting (95%) and plan to continue doing so in future.
Broken house rules, no communication,more guest( I'm lucky it was only once) and late arrivals account for the 5%.
Guest sometimes show up with infants that aren't indicated on their original Request.
When asked they say that as there isn't a fee for infants they didn't think they had to include them in guest total. It is good to indicate the extra fee ($100.00) per extra person per night.and hopefully you won't have to deal with this problem again.
To cover that possibility I now state on my listing that my mazimun guest total is 6 and that includes infants. More than six will not be allowed to enter. No exceptions.
I don't want to deal with the following;
You have to send a Money Request and guests adjustment indicating the extra guest(s) and extra cost and they must accept it before they enter your home. This makes for a less than agreeable start to their visit and can lead to a bad review as well. Best of luck and happy hosting.