Here are few more to consider:
-Access to your location can be a factor (trains, busses, parking, etc.). If it’s difficult to get to your studio many people might have seconds thoughts.
-How safe the area around your business is, could be another factor (close related to the access one) especially for women.
-How much competition exists close to your studio…the less the better.
-Demographics such as age and income are important and close related.
I hope it helps.