Mayfair is an established west-side neighbourhood, older than the city's newest suburbs, and catchment boundaries in an older area like this can be irregular where they were drawn decades ago and adjusted since, so two houses a few blocks apart can occasionally land in different schools.
Both school divisions publish their own boundary tools online, and calling the division directly is the fastest way to confirm a specific address rather than relying on a general neighbourhood reputation, since boundaries do get redrawn as enrollment shifts across the city.
For a buyer with school-aged kids, confirming the catchment for the exact house, not the neighbourhood, should happen before an offer goes in, the same way you would confirm the price against the city's $444,700 rather than the street name. Get your hand-reviewed valuation from Joel Dyck.