Pay my way and I'll personally show you around
But honestly, I looked at some of the current spas and I don't recognize any of them. It seems they've all changed over the years since I used to be a regular Montreal massage patron. But MC is right, your best bet is to join MERB, a sister site to TERB and you'll have plenty to choose from. You're lucky spending 3 days in Montreal, the best hobby city that I know of.
Whatever you do, enjoy yourself and maybe you can educate us on your return with reviews of some of your experiences.