This subway is run by an Indian manager who is almost always there. Every time I went, no matter if it's noon or 9:30pm, I saw him there, either in the back, or helping in the front. He's a pretty nice guy and keeps the place clean the tidy. You won't walk in and feel like it's a regular fast food dump; you will feel very comfortable eating there. Because it's slightly out of the way, it doesn't get a lot of customers in general, so pretty quiet atmosphere.
The only downside is the price. I don't know if the price in consistent through the Chicago area, but I've been to many Subway's in California, and the Subways in California had a lot more footlongs for $5 (maybe around 8 to 10). Here, they only had about four $5 footlong choices. But again, maybe it's just the matter of location.
Overall, a great place to get subway: clean, quiet, fast, good service