Old Montreal is so beautiful. This part of town was by far one of my favorite places to go to when I was in Montreal. I have never been to Europe (yet!), but the narrow cobblestone streets and the building architecture in Old Montreal felt very European to me, unlike any other city that I have visited. You can easily walk around in a short amount of time. You can browse (expensive) art galleries, go on reasonably priced and romantic horse-drawn carriage rides, eat at a fancy restaurant, etc. Even if you do not know French, you can get around just fine.