Nakano is nice! I actually live around here, but saying it nice doesn't really mean I'm biased 😅
Koenji is nice too! I've only been a few times though. Seems like a retro town.
Kappabashi? I've heard of that area famous for kitchen supplies. Is it in Asakusa?
Hope you can come back and have a vacation around Tokyo! Maybe we can have a Hive JA meetup by then 😅