Hathaway's is a diner nestled in Carew Tower. I don't go there often, but that's exactly why I ended up there today-- a coworker and I were sick and tired of eating at the same place every day.
It's a cute diner with okay food and okay service. I had fish and Jeff had a reuben-- he had a problem with his food, but it was rectified by the management and we scored a chocolate milkshake out of the deal. I would never brag about the food or act like that a real reason to go there.
Hathaway's is particularly known for its coffee, or at least that's the opinion I take away from it. (I'm not a coffee drinker.) I go for the kitsch of the old diner feel, and for a place where I typically don't run into my coworkers (in case you need to talk business).
It's a once-in-a-while, sick-of-everything-else kind of lunch. I wish I could give it a more glowing recommendation, but they can't all be gems.
By the way... if you go to Hathaway's, order "the Jeff Jones." He ordered his reuben with coleslaw instead of sauerkraut, and tried to convince the waitress to name the sandwich after him. I work with goobers.