Marben has a great rustic feel and has the exact atmosphere you want for a light brunch. Being new to the area, you don't actually expect a restaurant to be there as most of the buildings on Wellington are residential, but it still seems to fit in perfectly.
They provided a range of typical brunch items (benedict, eggs/bacon, huevos rancheros, etc.) but I was a bit disappointed in that if you wanted something besides eggs that there were few options for brunch. There were a handful of sandwiches and salads, but just didn't seem like enough... I had the huevos rancheros, which had some great spice in the salsa along with a very light salad (as if the person knew I only wanted 8 leaves of lettuce!)
Regardless, the service was pretty awesome. One of the waitresses even helped me put together a list of other restaurants to try while in the city that were characteristically Canadian, so I definitely appreciated that. She was also gorgeous, but that shouldn't really factor into the ratings =P
Long story short, great place to go, you'll likely really enjoy it, don't expect a "cheesecake factory-like" menu.
Side Note: I love how "hipster" is now an adjective we can choose below for ambiance. How ridic!