>>2017743Philly's streets are incredibly narrow by American standards, with most being 50' building-to-building or even less. This makes crossing streets somewhat easier than even parts of NYC, where Manhattan is bisected by wide north-south avenues every block for example.
Philadelphia is also wildly cheap in comparison. You can easily rent an entire rowhome for like 1.5k a month, and homeownership is unironically cheaper than in the surrounding suburbs.
Add to the fact it's smack in the middle of the NEC and the center of a fairly good regional rail network, Philly is genuinely one of the few areas in the US where car ownership is basically optional.