Airbnb Occupancy Rate?

[Melissa Kirchhoff]

I'm trying to work some numbers on a potential purchase. Now I realize this will be very specific to the location/property/price/marketing/etc but what would be an occupancy number you'd put on an Airbnb type rental? 

The numbers I have would work very well at 50% occupancy rate (15 days charging less than I would probably charge and pushing my expenses higher than I would imagine they would be and having cushion). So if that works, does that mean the numbers work? Is there something I may be missing?