I found Buca while wandering down King street just before 6pm. It has a quaint, low key vibe with exposed brick, wood beams, and lots of natural light. We were seated at a table near the kitchen.
The wine list is very extensive, but there are a limited number of wines sold by the glass. Glasses have two sizes: 3oz and 6oz. The pasta was fresh and made by hand. I had the gnocchi ripeni, which was by far the best gnocchi that I've had in a very long time; the filling, sauce and overall texture were amazing. My companion had the bigoli (duck egg pasta) which was also delicious. We were unfortunately pressed for time and unable to taste dessert.
The service was warm and attentive, and added to the experience. I'd definitely go back when I'm next in Toronto.