We stayed at Yi's apartment for five nights. It is considerably spacious and is located in a cute and quiet neighbourhood very close to Shinjuku. Yi is a very responsive and attentive host, and answered all questions we tackled him with almost immediately.
The location was good for our needs - the metro is about 10 minutes walk away (through nice, small streets), but buses run just outside the apartment and it's a short ride to Shinjuku and even Shibuya. Overall it took us at most about 40 minutes to get anywhere we wanted in Tokyo.
We also had to spend a whole day in the apartment because of typhoon Hagibis and we felt quite at home!