There are methods called lat() and lng() that exist on the geometry object's prototype. So to get the values, just use the following:
var place = autocomplete.getPlace();
var lat = place.geometry.location.lat(),
lng = place.geometry.location.lng();
// Then do whatever you want with them
console.log(lat);
console.log(lng);
console.warn('Warning: I didn't test this code!');
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