Which region of Google Cloud Services to use to reduce cost and latency

I am using google cloud platform to host my services. I have the following services running to support my application

1. App Engine
2. Cloud Sql
3. Cloud Storage

I need help in understanding which region to use to reduce latency and pricing. The application users will be based out of India. Based on the availibity of the above services, below is what I can do best

1. App Engine - asia-northeast1
2. Cloud Sql - asia-east1/asia-northeast1
3. Cloud Storage - asia-southeast1/asia-east1/asia-northeast1

The region "asia-southeast1" works best for me in terms of distance. But having all the three different regions is not adviced by google.

Is hosting all the three in asia-northeast1 the best option for me?