Possibly the best place one will be able to find in Shinjuku area, especailly in terms of location and price. For space issue, however, if you are travelling with two or more other people, and you are all like 6 feet tall, you might want to reconsider; this is for 3 ~ 4 average sized people.
A very friendly host that is willing to help: he provides clear guides to housrules and housekeeping materials, which were sufficient.
Located in the middle of Shin Okubo and near Shinjuku, in walking distance, it was the finest residence I have had in Tokyo. Will surely visit again.