I had a comfortable 5-night stay, overall. I stayed for a work trip, so I am mostly away during the day, and would be back after dinner (after 8 or 9) to rest. While the unit is clean, comfortable, and well-located in DuPont Circle, there's one surprising occurrence that I thought must be noted by others before booking this place.
In my case, I haven't seen Tanaka since I've checked in on Tuesday evening, but communication was great. He was very helpful, and made sure I was able to check in without issue. One evening (I believe Thursday night), Tanaka had people over at around 2:30 am. There were loud talks and music in the living room until perhaps 5:00 am. The room is not very well insulated, so I could hear everything... I was kept awake up to around 4:00 am, but fell asleep because I've been so tired (work trip). I definitely lost sleep... I had to be up early since I'm staying in town for work meetings.
I then saw Tanaka in the morning, before leaving to work--and, ask about the loud noise. He casually apologized... Much too casual, like it's nothing... I was taken aback, but much to my surprise, I then noticed before writing this review, that this exact occurrence had happen before to others (not once, but several).
My take: there's no hesitation of Tanaka bringing people over in late hours, despite having guests booking a room there. This is rather unusual for an Airbnb host to be so inconsiderate... I hope this review helps others, and Tanaka too to truly have a better consideration for guests that are booking the place to rest...