Best approach to rank on google maps?

Google says it's relevance, distance and prominence. Distance you can't change, so work the other two. Relevance: primary category exactly right, secondary categories, services filled in, a description that says what you do in plain words. Prominence: reviews (steady ones beat a burst), photos, and your site and citations backing up the same name, address and phone. And don't stuff keywords into the business name. It works short term and then gets the profile suspended.