I'd been here only once so first impression: I'm not sure if they're a pastry or a coffee shop but I mean these are supposed to go together. So i think they're both.
But what stood out to me is that they have a pretty breakfast plate -- the big breakfast type.
And, I guess the "breakfast" is their specialty because they happen to be the breakfast place of Tsai Hotel. I guess Tazza is actually the resto / cafe of Tsai Hotel.