Wow, fantastic! My sister and I stayed here for 6 days in this cozy apartment. Everything was well-furnished, clean, and the green folder was super informative (general rules, train maps, garbage sorting, etc). The futons were very comfy and laundry was a breeze (washer on the 1st floor; dry your clothes right outside your window!). The apartment is within 5 minutes from the station (SUICA card = definitely get) and you can easily connect to Ikebukuro (great for JR Pass holders to get on JR Yamanote Line).

Can't forget Taturo-san though! Taturo-san is the cool uncle with lots of cool stories, knowledgeable, and has a huge heart. He made our check-in process so much fun, we ended up talking for at least a hour! He also goes out of his way to help out guests like giving informative directions, recommendations, and he even carried our heavy luggages downstairs which is no easy task. In the end, he felt more like family than a host. It was very heartwarming and he's truly admirable.
He really made the entire experience in Tokyo the best. Thank you so much and we hope to stay again in the future!