I want to second Vespaio -- great great food, but I've only been a few times and never thought it was very rustic (maybe I'm a novice on Northern Italian food or just not ordered the right things.) It's terrific regardless. But, and not to be too critical or overly harsh, I'ld stay far far away from both Guero's and Chuy's. They're both well known and seem to have crowds, but Guero's is some of the worst tex-mex food I've ever had (yes, Bill Clinton ate there but has anyone ever confused him with a discriminating eater?) and Chuy's is just a chain restaurant (watered down and neutral as you'ld expect one to be.) Same really goes for Trudy's, which isn't anything special and feels like a chain with the food to match. I'll also second Las Manitas for lunch -- not tex-mex as much as a variation on interior mexican. If you want authentic mexican food and want to spend a little more, try Fonda San Miguel, but I'll add one warning -- they have some terrific items on the menu and some horrible, yes, horrible items (beginning with the tortilla soup.) For greasy tex-mex (which is the only authentic kind) I like Jaime's on Red River. FYI: Stubbs BBQ is great and just across the street from Jaime's. I'ld choose Stubbs over Ironworks, which I think is vastly overated (I'm not much on vinegary sauce.) If you want old, historic, upscale dining, go to Green Pastures, but they host several events on the weekend and may not have availability. I saw Aquarelle mentioned and I can't recommend it. There are much much better fine dining options than Aquarelle -- namely Jeffreys (which is the one upscale place you should go -- assuming Green Pastures is closed.) Hoover's is great for soul food and Threadgill's is pretty good for a chain type homestyle place. I like Eddie V's too, but it's a chain (small chain, from the owners of ZTejas (another good chain)) and the idea of fish being "flown in daily" to Austin is a joke -- maybe the special, but everything else in Austin is frozen (which is a good thing) including the fish at Eddie V's. Stay away from seafood while you're here -- it will never come close to what you get in New Orleans or Seattle. Castle Hill is good, but I'ld go for lunch instead of dinner -- not worth the upscale price and terrible atmosphere for a nice restaurant, but great for lunch. If you want a burger, you can't beat Hut's (Shady Grove is a decent backup, but it's just not Hut's.)