I am using "Here WeGo" https://here.com/ (originally developed by Nokia), quite a good alternative to Google Maps. It does not need any Google services installed. Downloaded it directly from the Google Play store with Raccoon.
You can use Raccon http://www.onyxbits.de/raccoon : "Download apps directly from Google Play. Raccoon is the only APK Downloader that also supports paid and large apps."
Same experience here. Prototyping in Python remains faster. The possibility to inspect variables on the go in a notebook are an invaluable feature of this programming language. Afterwards you can always implement the time critical components in Go.