I visited Tunnel Espresso Bar as part of my quest to complete the Montreal Indie Coffee Passport. Having tried out their delicious coffee, I really can't wait to go back! This coffee at Tunnel is awesome - an unforgettably rich and flavourful taste. The coffee beans are also responsibly sourced (roasted in Canada, I believe).
As far as I know, the only person who works there is the owner, Rob. He's tremendously knowledgable about coffee, and a fantastic person to have a conversation with.
There doesn't seem to be fixed hours of operation. They are typically open in the morning on weekdays.