You're being downvoted because bringing up Kensington tiktok videos connotes that you haven't researched the city yet. Kensington is in a small, isolated part of the city, yet is often the social media poster child for Philly.

The typical neighborhoods to consider when starting your search are Rittenhouse, Fairmount, Graduate Hospital, West Philly near UPenn, Washington Square West, Old City, Society Hill, Queen Village, East Passyunk, Fishtown, Northern Liberties, etc. If you need to bring your car prepare for street parking or paying more for an apartment that comes with parking.

As others have noted, 51k will provide a decent standard of living compared to 68k in NYC.