I know it's now February 2024 but just noticed this post, glad you enjoyed the city, great place to visit, not so much to live in these days!
Homelessness, drug abuse and mental health are major issues in the city, the latter is horribly undertreated here, the subway "system" (all three line of it!) sometimes feels like one big mobile homeless shelter/mental health facility, it's also notoriously unreliable and become a bit more stabby recently. I avoid Yonge Street too if I can, just seems to attract all the worst people!