There's not much I can say about Libretto that hasn't already been said, I'm sure - you should be well aware by now that the pizza is among the Toronto elite, if not the best pie in the city. My girlfriend and I frequent this location often (the reservations are key) and we've had most (if not all) of the Pescetarian-friendly choices on the menu. And I absolutely endorse them all, though above all else, probably the Anchovy pie comes highest recommended.
As if it weren't enough the pizza is perfectly made, the service is exceptional. They are always fabulous about reservations - I've been late before, and a brief call en route is all I need to hold the table, with no attitude whatsoever. Dietary restrictions are not a problem - my date couldn't eat seeds in it for a week (pretty tough considering tomato sauce is seeded by default) and our server hung around and helped us figure out what to do, and was more than willing to cater to our needs. They're always in a great mood, always dropping by the table to see how we're doing - and they do it with incredible tact, never going overboard with it or interrupting conversation...it's always genuine.
And the prices are reasonable, the bartender is talented. I couldn't find a complaint if I spent my whole life looking.
A+++