Hmmm... We allow infants, but not pets.
We just had a Instant booking checked out yesterday. The max capacity is 8 pax. They booked 6 adults, 2 children, 2 infants. That's 10. But infants don't count. So technically, it is within the max, by Airbnb standards.
However, despite repeated requests to the guest prior to check in, to let us know if the default configuration of adult/child beds and infant beds (2) was suitable for them, it wasn't until Christmas Day (the day before their arrival) that they they wrote back and said they needed much more than the default setup. I immediately responded thanking them for the information, but unfortunately, being Christmas day and the house has already been arranged for their stay, there is no chance of changing it now.
There were 3 families in this group, and the one who booked it (who all communication was conducted with, but didn't respond to our requests until too late) wasn't showing up for several days. The first family to arrive wasn't happy. They didn't know what to do. But we're nice enough to say "don't worry, we'll figure it out".
They ended up moving everything, removing mattresses from the beds and placing them on the floor (don't know why), dismantling the baby beds, and generally creating a chaotic environment. We were called to fix a technical problem And saw all of this. It seemed pretty uncomfortable. And although they put everything back at the end of their, stay, it was done sloppily, requiring a lot of extra work. I don't have a review from them yet, but I expect something less than ideal.
The reason I mention this is that your post reminded me of this, and the relevance is the infants. They don't count in the max number of pax, yet most definitely impact the ability to accommodate the guest comfortably.
Lastly, I've been reluctant to maintain instant book, but until now, I haven't had any problems, because I have all of the instant book filters on, and it tends to weed out the undesirables. But now I'm reconsidering whether to keep instant book. Mainly because of the infant issue.
Yesterday, I started to remove instant book, but the gauntlet of questions and advisories against it that Airbnb presents you with are daunting. They really don't want you to remove IB. And I suspect I'll take some sort of hit if I remove it.
So, I'm on the fence. It's just one "less than ideal" experience. So far...