Ryota's place was very clean, with the exposed concrete providing a nice contemporary aesthetic touch with the functionality of noise reduction.
The bathroom was very clean with all the promised amenities with the shower/bath being separate from the sink/toilet(washlet) area, definitely my preference.
The soundproofing is really worth it. I enjoyed playing the piano and listening to music using the bluetooth speaker late into the night without any problems. Walls in Tokyo flats are usually quite thin, and not having to worry about disturbing or being disturbed by neighbors brought immense comfort.
If I were to ever move to Tokyo, I'd try to find a flat like this one.