Hi Baris! Nice to hear from you again!
I run a company that also proposes calendar updates that are similar to what you offer as an explanation for doubling page views. I have configured updates every 15 minutes.
I have only seen minor effect, if any, on more than 900 listings managed on page views, or, more importantly, the ranking in search result. As a matter of fact, I now tone down that claim with every new customer, and have changed it to one hour to see if there was any effect. None whatsoever.
I have discussed on another topic why it is so hard to do proper A/B testing when you don't know what precise metrics are involved on Airbnb's side. It is certain that calendar updates are part of it, because in the end a guest can see what was the last time the calendar was updated. However, the two listings are not similar in respect to Airbnb's algorithm or in the eyes of the guests, because the aggregated number of stars for each listing is not similar. This should have an effect on ranking, and therefore, page views.
Could you also disclose which listings are "listing P" and "listing A", and the page views for the other listing? This is not documented.
Edit: I didn't pay attention to a few other things: both listings have not received any new guest since May or July, and the host has stopped hosting in July 2016, and the doubling of page views occured in 2015.