I stayed at Aileen and Naoki's for over a month! It was perfect for a longer stay. Close to multiple convenience stores, grocery stores, bars, and all sorts of restaurants. It's also in walking distance to Nakano Broadway (a low-key Akihabara).
The closest station is about ~8 minutes away on foot. There's a direct line to Shinjuku and Tokyo station.
The apartment itself is very cozy! Bright and well-lit. The walk-in closet was perfect for storing large suitcases.
I especially appreciated how responsive Aileen and Naoki were. They answered any questions I had, night or day.