Benna's is among the largest of the Polish bakery/delis on Roncesvalles (and there's quite a few), but even here the products are crammed in pretty tight, with many stacked on top of each other or on crates.
They have an excellent selection of Kolbasa and other kinds of cured sausage in their deli counter, but it's a bit tough to get an order in if you're not speaking Polish--fight on, though, cause they're great. The baked goods area is less impressive and a bit scaled back, mostly featuring bagged breads from other bakeries.