Pianos is pretty excellent. It's a microcosm of the Lower East Side bar scene more broadly: very trendy, but unpretentious. Prepare to wait in line if you're visiting after 9 on a Thursday or a Friday, but if you pop in off hours then you'll enjoy a cheap drinks and exceptional atmosphere.
Went there solo on a Thursday night while traveling through NY. This place has a really great vibe, lounge bar / with a good sized busy dance floor, a mixture of after work drinkers and your weeknight club-goers. Youngish crowd 21-35... A good mixture of nationalities, DJ playing some new and classic hip-hop / R&B.
I really really like this place. I often go on weekdays cause there is no line, but still enough people inside. Upstairs it's always fun and everyone has genuinely good time. I'm surprised that everytime I go there (even Wednesdays) the people are always in a party mode and even if you are not feeling the same, it will eventually make you wanna dance too in the end...
Got in no problem, place was not crowded. Upstairs was virtually empty on a Sunday night, so we sat by the bar. The bartender was nice to take some photos of us, however, it was 1:25am and there were no snack foods to munch on. We were told there were chips and dip, but they were out. Would've been nice to have something to eat while drinking.