Toku’s place is in a great location with a lot of space if you are not opposed to a quick train ride from Shinjuku. The stairs are narrow but you have 3 floors. My family of 4 stayed with more than enough space and beds.
There are two toilets, one detached sink upstairs and the center floor has the shower/ washroom. There were two convenience stores a few minutes walk away so you can pick up essentials.
We enjoyed our stay and would definitely visit again!