Bathroom Finder App

I wanted to make an app for people who have stomach diseases and needs to go super badly. An app in which to find the closet bathroom where you are with no trouble in your way. I want to base this app in New York City. New Yorkers know and understand how difficult to find a good yet semi-clean bathroom, whether it would have multiple stalls or a single stall. Another thing, there are certain restaurants in the city that cannot let people use their bathroom if they buy something from them. If you gotta go, you gotta go!