Awesome location in Okubo. Super short walk to the Shin-Okubo station, so getting to wherever you need to go in Tokyo is incredibly simple. Very affordable with all the amenities you need for a good resting place. Being able to check in on your own is fantastic, and made it very convenient for us when we were arriving late. The bed is comfortable, the room is well insulated, and the bathroom is enjoyable. Easy communication with the host.
The only complaint is the walls and floors are incredibly thin, you can hear everything the guests upstairs are doing. Got woken up several times by them either walking around or... other things.
I would stay with Ichiro-San again, but may stay in the second floor apartment to avoid the upstairs neighbor noise.