Gloria F.
Yelp
Pssss.... Shhhhh.... There's a secret Art of Joe, called "Joe Pro Shop & Headquarters" mid block on 21st between 6th and 7th Avenue. It's pretty much undiscovered, as evidenced by the minimal lines for fabulous java.
If you are familiar with any of the Art of Joe's in the city (Waverly, Union Sq, West Chelsea, GCT), then you know how delicious Joe is. I put Joe in my bucket of amazing 3rd wave coffee bars in the city, including Grumpy, Stumptown, Blue Bottle.
The beauty of Joe Pro Shop is the LACK of line. Beautiful espresso, single pour coffee without the hectic pace of most of the other Art of Joe locations (GCT - M-F is a ZOO!). If you are a brew your own aficionado, they sell a ton of gadgets, gizmos, props, toys, and ingredients to the delight of any coffee connoisseur. The corporate HQ is also in this locale, so you feel like you are more in a coffee lab. There isn't a lot of seating, but if you are wanting to enjoy your java in peace, the place is completely chill.
Only downside are the hours. They close early (check the website) and only open at 8am during the week, and maybe 9am (Sunday and Sat ? - unsure). If you are waking up with the birds and jonesing for Joe, go to either 23rd and 9th Avenue, or Cafe Grumpy (my favorite) on 20th between 7th and 8th Avenue.