Yep. This is one badassed coffee shop.
About the size of a deck of cards, this isn't the place you pop into with a large crowd. Little Nicky's is definitely a place where you fly solo, perhaps accompanied by a stack of magazines or an ironic use of a discman from what I saw during my stay.
Learn from my mistake and go a little bit hungry. As soon as you walk in, you're going to get punched in the face with the smell of mini-donuts which can either be intoxicatingly good if you're peckish enough to order a half dozen in a sugary cup, or kind of nauseating if you've arrived right after a solid lunching.
Vivek is bang-on about the music though. From motown jams to high school flashbacks, every song seems to be a forgotten classic that'll keep you groovin'.