It was surprisingly quiet inside, despite staying over the New Year period. There are three Korean grocery stores on the same street and many convenience stores and restaurants nearby. The location was great for us to access the JR Yamanote and other JR lines (approx 10 min).
Miko answered quickly when we had trouble checking in (make sure you have the code before you arrive).
Apartment itself is good size compared to typical Tokyo hotel rooms. If you are very tall the bed may be too small.
It was all clean & tidy when we arrived. The bathroom is much bigger than what I've seen of typical Tokyo apartments.
The only negative is that the balcony was a little dirty with some cigarette butts left behind from the previous renter and unfortunately one of the chairs was broken (not sure if Miko knew it was broken), and we'd have liked to use the balcony more comfortably.