Carlos was very nice and helpful!
I was stressed to get in time at the airport the next day, but he helped me by taking me there in the morning and he was also very kind and told me a lot of information about surroundings, what should I visit, where I can find good food. Plus he gave me his recharging ticker for the subway to visit the center, so I did not have to pay for that.
Totally recommend for a layover!