Absolutely. My ma moved out Philly to Bethlehem recently and I think that'd be a great place to live. Granted, I only visit ~4 times a year, but she loves it, as do a lot of my thirty-something friends.

It's a mistake to scratch off the Allentown area. The whole Lehigh Valley has gone through a massive resurgence that past ~decade, and I think it's wildly improved across the board. Bethlehem is becoming a great place for my mom to live and checks a lot of your boxes.