You named a few areas, and the vibes / attitude / politics of those areas can vary by quite a bit. Without knowing you, it’s hard to recommend which is best, but it’s hard to imagine how some of these places end up on the same list.

Your price points will make buying into places like Chestnut Hill or the nicer parts of Mt. Airy hard, unless you take on a project or get lucky. Both are also much less urban than the others, but each have their little commercial areas that are walkable. But, to get to downtown by transit, you’d need to take regional rail. It’s nicer than subway/El, but less frequent and costs more. Wissahickon is an absolutely gorgeous piece of nature though. There also actually a small neighborhood called Wissahickon up by Manayunk that maybe you’d want to add.

One issue with the Northeast is that if your plan is to take the El as your transit option to downtown, you’ll pass through the part of the city most ravaged by opioids on your way between the the NE and center city. you’ll definitely see some shit during those stretch of stops.

I saw no mention of West Philly. Some parts are rough, but parts closer to the universities are popular, and it’ll definitely have more trees than, say South Philly.

Definitely visit. There’s some neighborhoods that have great walkability, restaurants, relatively low crime, etc. that lots of people love but can be a lot of concrete and brick with not much trees or much in the way of nature.

It kinda depends on how much nature you need.

Like will street trees, a city park, and the running path along the river cut it? Or do you need like legit Forrest / creek (like Wissahickon, pennypack park, etc.)