Locke Library is a fairly standard mid-sized Toronto Public Library branch, but I'll always have a soft spot for it because I grew up nearby. A facelift in the 90s updated it, and it has a lovely spot on Alexander Muir park with a playground nearby.
I don't know the collections intimately, because these days I mostly use it to pick up my holds (and that is a five-star system, holy god), but it's a lovely spot to sit down and read for an afternoon, and I recall it having a great selection of kids' books.