def METHOD_NAME(self):
    """
    Return the string representation of the valuation ring.
    EXAMPLES::
        sage: K.<x> = FunctionField(GF(2)); _.<Y> = K[]
        sage: L.<y> = K.extension(Y^2 + Y + x + 1/x)
        sage: p = L.places_finite()[0]
        sage: p.valuation_ring()
        Valuation ring at Place (x, x*y)
    """
    return 'Valuation ring at {}'.format(self._place)