Overall this is a great place to stay.
Here is a breakdown of my ratings and some things to note:
Location 9/10 - for me this was an amazing location, very convenient and easy to get to (in between the JR Yamanote line and Chuo line) with lots of amazing bars, restaurants and shops around. There is pretty much anything you would need (grocery store, pharmacy, combini, atm) within a 5 min walking distance. Only thing is the area gets pretty crowded and sometimes rowdy at night, so if you are someone who likes quiet, relaxed neighborhoods this may not be the place for you (although no noise inside the apartment itself, don’t worry!)
Amenities 9/10 - great amenities with almost anything you would need for a short stay including kitchen and dish ware, ac/heater, laundry (washer only), even dish & hand soap, towels, shampoo & body wash etc. even has heated floors!! One thing I will say is they do not provide extra toilet paper, trash bags or tissues which they could easily provide at very little cost. And, they don’t have a drying rack to dry clothes on the balcony (like many Japanese apartments do) so was hard to dry clothes.
Apartment itself 10/10 - nothing really bad to say about the apartment itself! Very big for Japanese standards, modern, clean with updated amenities and finishes
Cleanliness 8/10 - when I first arrived, for about 5 days there was a nasty sewage smell wafting through the entire apartment. I called them and they did put a cleaning solution in the drains but it didn’t go away so I had to buy baking soda and vinegar myself to unclog/deodorize the drains. It did get better after that but just a warning! And a note for anyone else who has experienced this odor issue! Otherwise very clean and well sanitized.
Hosts 10/10 - very good and responsive hosts. They usually get back to you within an hour or two and are very helpful.