The location of Nakano was perfect - close enough to the main city but a safe haven away from the city center craziness. It is 2 stops from Shinjuku so it was really easy to get around by train (we loved our M train!!) The location is awesome and recommend this place just for that alone.
Ozat had towels, plenty of supplies, and even toothbrushes for us. He was a great host who even provided suggestions. We had a fun night eating at a local ramen spot just down the street!
5 San Franciscans (1 couple + 3 other friends) fit in this space but we wouldn't have wanted much more. After talking to a colleague who lives in Tokyo, I've realized that places in the city are just small. I think this was the best option for our group.
Things to keep in mind:
1) Any more than 5-6 people for a week in that space would have been uncomfortable.
2) The bathroom setup is different than in the states. There's only 1 sink (that was technically in the "kitchen" that was next to 1 of the beds and basically attached to the living room) so orchestrating getting ready in the morning with some people sleeping was a little tough + the boys had a hard time shaving. But we made it work!
3) If you are super sensitive to noise, the fire department on the corner or noise from the street (this unit is on the 1st floor) may wake you. But we were so exhausted most nights we barely noticed.
Overall it was a fantastic place to call home for a week! We would come back again.