With that income you could honestly live anywhere. Are you thinking suburbs? Downtown? Do you need a parking spot?

When I was a PhD student at UPenn I lived in Fitler Square, which is an amazing neighborhood and an easy 20 minute walk to campus. I now live in Washington Square West (only a few blocks from my dissertation chair ironically). It's a bit quieter, but walkable to restaurants and parks. The #40 bus is a 20 minute ride from here to UPenn and drops off all over campus.

If you haven't yet, definitely try to come out and visit. Philly is a city of neighborhoods. You should definitely come out and explore to get a sense of where you'd like to live.