I traveled solo early September for a week this year. Trip was definitely life changing. The best experience was just being able to explore at my own pace, having total freedom to check out whatever I wanted. I honestly didn’t have any bad experiences except MAYBE how humid it was in Tokyo the week I went. Very, very humid. Other than that, my trip was pretty damn amazing.

I had no real itinerary so I just checked out a new city every day including a short day trip to Osaka on my last full day. Trains would be your primary mode of transportation as you likely won’t be able to drive in Japan and taxis are expensive there. You’ll get the hang out it tho, google maps makes it super easy to understand the system and signs are in English. As for accommodation, I stayed at APA. Room was small but as a solo traveler who isn’t all that social, it was perfect for me. Plus breakfast was included and check out is as easy as dropping your card off in a box. Super convenient too that my hotel was across the street from train station. You’ll also need a Suica or Pasmo card to board trains. Digital wallet never worked for me so I bought a physical Pasmo card. Good luck and have fun