Thanks for your feedback Ishan. I also noticed when I got back home after your departure that two of the windows on both sides of the apartment were slightly open which will explain why you can probably hear from outside.
My building is brand new with very thick windows that are suppose to be sound proofing. I live in a fairly quite area that is neighborhood oriented with trees not much traffic etc compared to other parts of NYC that are very noise with a lot of traffic etc.
I'm a very light sleeper as well and I never had a issue with noise but I'm Glad you enjoyed your stay :) Happy Holidays and have a great New Year thanks so much.