M. has provided a clean space for my girlfriend and I to stay during our few days of traveling. We were glad to experience living within the neighbourhood of Ikebukuro and we loved that the surrounding was very peaceful/quiet.
There is a train station that is within walkable distance from the apartment, but do note that you will need to transit to another train line in order to travel to areas such as Shibuya, Shinjuku and Shinagawa.
Another point to note is that the apartment is not very spacious (bathroom, toilet, living room) and it is not easy to move around. On top of that, the ceiling is extremely low from the sleeping area and unfortunately, it was not really comfortable (but bearable) for us when we go to bed. For context, we are around 1.56m to 1.74m in height.
Overall, it was an acceptable experience but I would consider staying here again only if I travel to Japan alone in future.