Public Transport in Madrid is one of the best options you have if you are visiting or living in the city. It will cost you less money than a taxi and you will have the same quality of commodity. All buses in Madrid are equipped with Air conditioner and a System that tells you how far away the bus is from the stop you are, this will help you manage your time better.
Metro is also welled equipped such as Buses. We always recommend you to have all your personal belongings with you to stay away from thiefs.