Be aware: This unit is not as pictured as in the photos (these are many years outdated). Despite trying to relocate upon arrival, we ended up staying due to lack of availability and spent much of our time problem solving with the host.
Cleanliness was a big issue—the unit had debris and the bathroom was uncleaned when we arrived (though the host did send a cleaning team once requested). Blinds and window coverings were stained and torn. The couches in the unit are different than pictured, both extremely worn and stained (our host did send a couch cover). Some lightbulbs were burnt out and the place was just generally run down with scuffs, marks, and stains throughout.
Some positives to note: It's huge for Tokyo standards, it gets lots of natural light, and the location is wonderful and peaceful (very close to Sasazuka station).
All in all, we managed to make the unit work. If it was cared for, it would be a great place to stay. That said, it would be difficult to recommend.