It's the same as page views for a website. It's going to fluctuate based on interest in the area at that time, availability of your rental as people are searching, etc. It just means your rental came up in someones search results and they looked at it.
I just had some related confusion about "booked days" stat. The % of rentals for the month seemed off from the % displayed.
I think "booked days" actually represents days someone confirmed a rental. The rental may take place that month - or in the future. It's just tracking the action of someone confirming a rental (making a purchase) in a month as a % of views your property had in that month.
The bookings you have in the same month that were confirmed prior to that month are not included in this stat.
So, If you have 100 views in February...
AND 5 people confirmed reservations (made purchases) in February. You have a 5% "booked days" rate.
You may have a total of 8 rentals in February
That means 3 of those rentals were booked in prior months - it only tracks your "click-through/purchase" rate for that month.