Hi Ana,
I should note that, here we provide support for Google Cloud Platform-end products and your question seems to be a general one.
If your question is about App Engine locations, note that App Engine is regional, which means the infrastructure that runs your apps is located in a specific region and is managed by Google. Latency, availability or durability are primary factors for selecting your app location. If you are expecting high traffic for your App Engine app, you should design your app to scale up properly. You may take a look at this article on “Designing for Scale” which talks about some best practices to ensure that your app will scale to high load.