Our mobile app helps in getting content based on the Neighborhood that the user has selected. Also, we know that users would like to receive content from more than one Neighborhood. What would be the best way to engage the user to do this step and make it seem effortless?
The simple solution to your problem is to explain why you want to turn on their location sharing setting and how it can benefit them. The way you actually design the interaction can be however you choose, but the core tenant is explaining the reason and benefits for turning their location on.
When your app is turned on, you are able to ask permission to turn their location sharing service on (which can be stored as a default setting after agreeing to the terms).