I'm pretty conflicted on how to rate Rose Tea Cafe. The food is quite good and they come out quickly. In addition the hot bubble tea is the only one in Pittsburgh that I've found (and it's good).
That said the service by the waitress is fairly terrible. The waiter they have is fine but the waitress has a terrible attitude both times I've been there and the second time they weren't that busy either so I know it wasn't just a "bad day".
Two star service + four star food.