The gritty urban feel is definately there and really Iike the light you have captured. I think you can afford to lighten is just a fraction, and I think this will 'invite' people into the photo just a bit more.
I think it's a great spot - we must all walk past scenes like this all the time, but you've done well to see the image.
What the image is missing I feel, is a touch of drama. If it's near where you live, could you try to go back and repeat the exercise but lying on your belly on the ground with a slightly wider angle? I'm not sure if this is a particularly savoury idea because I don't know the place
but what it would do is give you a more dramatic perspective I think. You could then include the top of the steps without losing the dark underpass and the grafitti...
Being able to see a little more of the dark underpass and then being able to see the top of the steps would really make them seem like an escape route - a true stairway to heaven
Altogether though, this is a great idea and I like it.