We're headed back out to NYC on Saturday for a week. I have been to Yonah Schimmel's (which is often touted as the best in NYC) and was relatively unimpressed with their knishes. Wrapper was too soggy, and not much flavor in the potatoes. The broccoli knish was better. But in NYC, I would expect that there are amazing knishes, and if Yonah Schimmel's is truly the best, then I must weep. :-)
I have read here that many folks used to recommend Knish Nosh in Queen's, but that this place has gone downhill recently. We will be relying on public transport, so would be looking for a place near (within about a 5-block safe walk to) a subway or train station.
P.S. -- I like the Noodle Kugel at Yonah Schimmel's, the pastrami at Katz's, the corned beef at Carnegie Deli, the donuts at Donut Plant, the Lemon Cupcakes at Sugar Sweet Sunshine Bakery, and the bagels at H&H on the upper west side. Rugalah at Ben Ash is also quite good. But, we're open for suggestions as to anywhere to eat or to get stuff to eat back at the room.