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Please remember! This translation is my personal work. It is sometimes difficult to translate word for word from Spanish to English, so it may sound awkward in one languange when it is perfectly natural in the other. But I think you can get the general idea!
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Every day is the same on my hallway
I never make it to my door without hearing the catcall
Of a boy who tells me he抯 waiting for me
What he should do is go take a bath
And some boring guy stops me again
And I pretend to be interested
When suddenly, out of the elevator steps
The picture of my dreams
The one I want to belong to
The boy from apartment 512
The one that makes my poor heart jump
He抯 the one to whom I write letters night and day
That I can抰 send
The boy from apartment 512
He抯 the one who makes me stutter and more
He抯 the one I think and dream about night and day
Him, only him

And an old man invites me, "Girl, come and see me.."
And I tell him I don抰 really like dirty old men
And I walk to my room really slowly
Hoping to see him
And when he comes out to walk
He greets me with a smile
That truly conquers me

But today I have really decided
To confess all my love to him
I knock on his door and I get chills
When a blonde answers
And my heart breaks

I truly felt my heart breaking
When suddenly she asked me:
"Were you looking for my brother?"