Hi. I live in a small apartment in New York City.  It's very hot today!
Oh wow. That's expected judging by the fact that it is the most populous city in the United States.
And all the concrete and asphalt doesn't help either.  Yes it is the most densely populated city in the US for sure.
The figures are unbelievable, as at 2016 there were estimated 2016 population of 8,537,673 residents there
And the diversity is unmatched also. It has the largest foreign  born population of any city in the entire world. 
One thing I can tell you for sure is that It  has a mix of  cultural, financial, and media and tops other cities , it's influence on  commerce, entertainment, research, technology, education, politics, and sports is high 
There was almost 63 million tourists visiting the city in 2017.  So much to see and do, and eat.
landmass and one of the world's most populous megacities, with an estimated 19,979,477 people in its 2018 Metropolitan Statistical Area and 22,679,948 residents in its Combined Statistical Area. A global power city, New York City has been described as the cultural, financial, and media capital of the world, and exerts a significant impact upon commerce, entertainment, research, technology, education, politics, tourism, art, fashion, and sports. The city's fast pace has inspired the term "New York minute". Home to the
most densely populated county in the United States, after New York County (which is coextensive with the borough of Manhattan).
With a land area of and water area of , Kings County is New York state's fourth-smallest county by land area and third-smallest by total area, though it is the second-largest among the city's five boroughs. Today, if each borough were ranked as a city, Brooklyn would rank as the third-most populous in the U.S., after Los Angeles and Chicago