Okay, I searched and couldn't find anything about this restaurant -- Aslam's Rasoi -- on Chowhound so I feel morally compelled to post about it.
First, I'm not actually affiliated with this restaurant. Well, I have a loose affiliation, in that I live a block away from it and really like it and would like it not to close.
Aslam's Rasoi opened a month or two ago on Valencia just south of 21st street, right across the street from Ritual Coffee Roasters. Before it opened, in that same space was a different Indian restaurant, named Rasoi, that was decidedly mediocre.
I'm not sure why they didn't change the name more dramatically, but at any rate every time I walk by the place there's almost nobody eating there. I think people don't realize it's a new restaurant.
The chef is Mohammed Aslam, previously of Roti and India Oven before that. The food is awesome. I am, right now, eating the Paneer Tikka Masala and their Goat Cheese Naan, with a Roohafza (yogurt & rose.) It's pretty straight-up Northern Indian cuisine, but the spicing is really nuanced and original and the food is just top-notch. It doesn't taste like generic North Indian food, it's in a league of its own as far as restaurants I've been to in SF so far.
Prices are in the low-to-middle range, a "high one dollar sign", in the citysearch parlance. My meal, for example (entree, naan, yogurt drink) was $21.
I have to think it's just their poor marketing & failure to pick a new exciting name that is resulting in the slow business, because Dosa, a block north, is routinely so packed there's a wait, and while it's not an apples-to-apples comparison (Dosa is southern Indian, not northern) I think Dosa is the inferior of the two.
I'd encourage everyone to give them a shot, especially because then they're less likely to close on me!