Manami's place is located in a very convenient location almost exactly between Kōenji and Nakano stations on the Chuo line. The neighborhood is relaxing and lively at the same time: the house is near a school, and there are many cats to be spotted on your walk to either station!
The house itself was perfectly clean. Check in was very easy and the directions Manami provided to the place made finding the house a breeze. It is a first floor apartment in a building with about four units. We didn't see or hear the neighbors at any point, though we wouldn't have minded!
There is a small balcony that is accessible via sliding doors, but it is only big enough for one person to stand on. We only used it for our first breath of fresh air in the morning, and drying our clothes on the provided hangers.
Notes on the beds: I have slept on traditional Japanese futon before but the one at this house were particularly firm to me. I have heard side sleepers like me have trouble with Japanese futons in general, as most of the pressure is on their ribs. Thankfully Manami was able to provide an extra layer of futon when we requested it which helped a lot.
Another thing to be noted: as you can see in her provided pictures, the beds are accessed via a ladder. We are 30 years and in decent shape, but it was still a bit of a chore, especially if you get up a lot in the night like I do.
Overall we would certainly stay at this place again if we found ourselves headed to Kōenji again!