After-theatre coffee or drink in Front and Church area?
In terms of pure coffee shops, I agree with robgm, the options are a bit limited. There is a Lettieri location that is open late on the south side of Front street, near Jarvis, and another new location a few blocks north at Adelaide and Victoria which is *very* quiet on weekends and evenings.
For drinks, most of the places in the immediate area are noisy pubs, probably not what you're looking for. The King Eddie recommendation is a good one if you're looking for a more upscale place. You could also try stopping for a drink after the dinner rush at some of the decent restaurants along the Colborne/Wellington strip, such as Trevor, Lucien, Colborne Lane and Six Steps. But these will have a trendy vibe and possibly will be too loud for quiet conversation.
38 Wellington St E, Toronto, ON M5E1C7, CA
36 Wellington St E, Toronto, ON M5E1C7, CA
King Edward Hotel
37 King St E, Toronto, ON M5C, CA
45 Colborne Street, Toronto, ON M5E 1P8, CA