What is the best back end for an android app?

I need geolocation, chat, push notifications. Anyone recommend me a particular BaaS (usegrid, deployd). I've no much experience with js or JSON. I've trying Google App Engine, but is a nigthmare, there a million of errors and the worse of all is that you can't find the solutions. They are constantly change the backend, and deprecating things, and de GAE plugin gives errors in Eclipse. Any recommendations, node.js, mongodb, django REST,..??

Best regards