Need suggestions on which area to live in the 首都圏

Hello, I hope this post does not break any subreddit rules.

I am moving to Tokyo in two months for work and am looking for which area to live in. So here is the situation:

1. The office I need to commute to is close to Tamachi Station (田町駅).
2. I need to work in the office two days per week; thankfully, the working hours are flexible, so I can avoid rush hour.
3. Given (2), I am okay with a little bit long commute (~1 hour).
4. I love trail running, so it would be a great bonus for me if it is close to trails with some elevation. (which is hard to find in Tokyo.. apparently)
5. I am living alone, so I am looking for a 1DK or 1LDK layout.
6. Rent ideally below 120,000 YEN per month.

Currently, based on this criterion, I am looking at the area around Hachioji (八王子) and along the Chuo line (中央本線) in the west. Though, on the other hand, I am a bit worried if the commute would become too exhausting. Or is there any other areas that would fit my criterion?

Any ideas, comments, and suggestions would be appreciated.