Many things went wrong during my stay.
1. The operator checking me in had a difficult time understanding me (even though we both spoke English fluently). I had to repeat myself several times.
2. I found a large, thick hair on my pillow as soon as I checked in. It wasn't even my hair color so I know it wasn't mine. It made me question whether the room had even been cleaned before my stay.
3. There was a huge square hole cut in the blinds, which let in sunlight when I wanted to sleep in in the morning. Anyone walking by at the right time could get a free peep show of what I was doing. I had to put up my own barrier to block the hole and get some semblance of privacy.
4. At one point during my stay, I was very sick (spontaneous pneumothorax) and had to go to the emergency room in Setagaya. The doctor there recommended that I stay bedridden for a few days. But Hiro insisted on having a plumber and blinds repair person check my room. (The blinds did not even end up being fixed). Why this wasn't done before my stay, I don't know.
5. To top it all off, the internet stopped working while I was there. I didn't bother telling Hiro because I didn't think he would actually do anything about it. Luckily, I had an unlimited data plan and could use my phone as a mobile hotspot, but the internet was very slow as a result. I work remotely, so this was a huge inconvenience.
I emphatically do not recommend this place. I recommend Base Hanegi in Hatagaya instead. It is much more accommodating and comfortable than here.