Luna's airbnb was good in terms of location, size and cleanliness. It was literally a few steps away (just beside the Okubo Station) which is the station after Shinjuku! There were also a lot of good establishments around.
One of the challenges was the narrow stairs going up 3rd floor esp when we did the check in/out. There was no elevator.
Also, we were not able to use the beds. it was all broken. In fact, one of our group members sustained a bruise on his back because he feel from the bed. I hope this gets fixed tk avoid hurting other guests. Or you can just put the mattress on the floor for your safety.
But overall, it was a good place in terms of location and size.