We are family of 4,with kids 6 and 11 yrs.
From Porto we are going to Madrid.
So is it advisable to take plane to Madrid or go back to Coimbra around noon and wander around the city and take the night train 11.30pm to Madrid. In both cases we have to do shuffling of luggage once, be it airport or train. Cost wise Air is cheaper for 50 euros.