I find this photograph effective because it's such a random and ordinary urban scene, and yet it seems to be about birth... death... and everything in between. I love it when a photograph of something so very ordinary can become so extraordinary.
It's not typical of Kertesz except for the angle, perhaps. Normally his pictures have fewer people in them. I first saw this photograph when a photography instructor showed it to the class, and said you don't see this one much. It took me years to finally find it in a book... so I quickly bought the book, and have studied the image from time to time over the years.
How to get this type of shot, Matti?? Persistence and commitment, I suspect, and a well trained eye to recognize when the stars are about line up for you in front of your lens!