This unassuming spot is a great efficiency loft studio. It's plenty of room for a solo traveler in Japan, but can definitely sleep a few. It is a classic Japanese studio with an extra loft that I can see really being helpful if you have a few people, but do keep in mind that it's thin from a traditional American viewpoint (not a negative just a heads up). I've stayed in 5+ Japanese studios and this was by far one of the best.
That said, it has everything you'll need for a stay in Tokyo: induction hot plate in a fully usable kitchen, Japanese bath, nearby food options (kushikage, bakery, ¥100 store, 7/11, and a supermarket are all very close), and is a short walk to the station. Additionally, there is already everything you need to use the amenities: shampoo & conditioner, oil, dish soap, and laundry detergent. The house manual is extremely detailed and helpful, and it's clear care has been taken to make an English speaker as comfortable as a native.
The residential area is nice and the shopping area nearby will allow you to sample a wide range of classic Japanese food at reasonable prices, all while staying out of the hustle and bustle of the city. Despite that, it's just a quick train into Shibuya, making the city life accessible while allowing a great place to recharge.
If friends or family visit, I will point them to Kumina and their rentals in the area. If this spot was available for longer, I would've extended my stay.