Airin's place is great for a Tokyo visit. 2 Metro stops away from vibrant Shibuya but tucked away on a small street with peace and quiet. Sangenyaja is a very nice neighborhood with a lot of good restaurants and tiny pubs.
Use the Metro - it is easy to get around. We used the Passmo card which was very convenient. But remember the Metro stops at midnight.
Airin's apartment was a bit tricky to locate for us. Follow the photo guide closely and don't be afraid to ask. We asked a local hairdresser who left his customer sitting in the chair and took us 2-300 meters down the street and pointed to the exact location. People in Tokyo are very helpful.
The apartment has everything you need. Even a washing machine. Although unconventional in operation (from an European point of view) you just follow Airin's 1-2-3 instruction and the job gets done. The beds are futon but even I (age 50+) had no trouble sleeping. The 10-15 km walking a day also contributed to that.
We had a small problem with the wi-fi but Airin's husband came over and fixed it in half an hour. The internet coverage was excellent.
The biggest challenge in Tokyo is the language barrier. So be prepared that people might not know a single word of English. But everybody we meet was super helpful.