Great value, very convenient location, but cramped and lacking sound insulation, which is pretty standard for Tokyo.
My girlfriend and I stayed here for a month. The location was awesome: residential neighborhood close to two stations and with lots of conbini, restaurants, and great bakeries within a couple minutes walk. The upstairs loft sleeping space was super cozy, and the amenities were as described. The pocket wifi was quite convenient.
Like most Tokyo spaces, this apartment is very cramped, though. For two relatively small sized people, we struggled. The combined bathroom is small enough to touch all 4 walls at once without stretching your arms.
Sound insulation is also lacking, so we could hear the people in the next unit over speaking fairly often.
When we arrived the heating unit wasn't working. The host sent someone to fix it about 20 hours after we reported the issue, so for our one month stay it wasn't a problem, but for a shorter stay, it could be.