Displaying a city name with concatenations
A model should not have presentation logic, and be mostly about containing data. The text "You are from ..." Doesn't belong in a model. As it is, your model includes logic that concerns representation, and so you're violating MVC. You could use another class to be in charge of formatting a Model instance. In other words, it would be best if your Model just contained fields and did nothing else. Furthermore, all fields can be private final, for example:

public class City {

    private final String name;

    public City(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }
}


I removed the other fields which seemed quite pointless for a model.
And I renamed Model to City, because "Model" is way too abstract and not useful.

In the activity it's strange to create fields when you only use them in onCreate.
It's best to limit variables to the smallest scope necessary.
As such, all these fields should be local variables in onCreate, like this:

EditText input = (EditText) findViewById(R.id.vInput);
TextView output = (TextView) findViewById(R.id.vOutput);
Button control = (Button) findViewById(R.id.vControl);


These names are terrible by the way.
(Now I realize your question may have been rather hypothetical, not a real program.)
Give them better names.