As you're well aware if you're reading this, we aren't exactly coffee experts; we're hotel experts, but we tried an Americano and a Cappucino for the hell of it and can report that they are pretty tasty. Although we weren't lectured on the heritage of the beans as we had expected, the cafe does have an appropriate level of pretension. We wouldn't make it an outing again, but we would swing by if we happened to be in the area (which isn't often, it's not much of a destination neighborhood).
There is only a bar along the window at which to stand, enjoy your coffee, and stare out at the (not so) lovely activity on 29th Street, but through a door you can enter directly into the moody lobby of The Ace proper. Oh yea and the staff at the door was totally sporting the drab green Converse high-tops. We noticed this of course because we like a little spoonful of designer uniforms to mix in with our snobby hotel coffee.
Note: It's CASH ONLY, unless you are a guest at the hotel and then you can put it on your room charge. Espressos start at $2.50, cappucinos are $3.50, coffee is $2 for a small, $2.50 for a medium and $3.25 for a large. Tea is $3.
For a few more photos of the Stumptown coffeeshop at The Ace NYC, check out the Flickr set.