I had a good stay at Naruka's apartment. I would recommend it!
Pros:
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Great location in Shibuya. Sufficient apartment with all the important amenities. The host uses a service to help manage the rental of the apartment, and that service is excellent. They communicate quickly and are very organized. The check in instructions are great as well.
Cons:
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(I'm giving this apartment a 5-star rating, so although I'll list these "cons", they were pretty minor.)
Like many Japanese apartments, Naruka's place is extremely small. It fits one traveler best. You may be able to fit in two travelers, but it will be cramped. The other thing to note is that there can be some street noise in the early mornings since it's located on a fairly busy street.
The bed is a bit creaky. I would recommend to the host to replace the bed frame. I personally had and issue with the bed frame coming apart during my first night at the apartment and had to spend the night sleeping on the floor. The host visited the next day to adjust the frame and it wasn't a problem after that.
Thank you!