Anecdotally, the Starbucks at the very center of downtown Austin usually has a couple of homeless people in it. They'll come in, use the bathroom, get some AC, maybe even take a nap in a chair. The baristas happily refill their cups with clean water.

As a customer, there's sometimes a smell, and you tend to sit where you can keep an eye out (since you never know the mental state of people in that situation), but I've never witnessed any real problems.

Honestly, it's heartwarming. It's dystopian, of course, that the provision of basic needs like these falls to a private coffee chain, but regardless of that I admire what they're doing (even though it's probably PR-driven, if we're being honest). It's not unpleasant enough for me as a customer that I'd refuse to go to that location (or even walk half a dozen blocks to the next one).