If you chose to get a taxi, price is obviously more expensive than bus and subway but it is quite economical in comparison to Europa or EEUU. What we can recomend is always taking the taxis from the companies of Radio taxi: they are all black with the yellow roof. They also all have the license number on the doors and a cartel on the roof with the name of the company of Radio taxi and the phone number. If you want to avoid any problem, the best solution is asking for a taxi by phone.