Firstly the location is Fantastic, your one stop from the yamonote line which gets you to 80% of the places you'd want to go. The area is really nice and residential but a few blocks from some nice bustling street to grab some local grub.
The house itself is so nice. The giant wet room is a highlight, as is the double heighted living room space. Check in was simple and iPad face to face check in was a novel touch.
We had 5 people and never felt like a fight for space or bathrooms as there is a second toilet downstairs .
Would love to stay here again on my next trip to Tokyo.