My stay at Kei's apartment was very smooth.
Only 8 minutes away from the main metro line in Tokyo, 1 minute away from the convenient store, and lots of good food places nearby.
Although the place looked newer and bigger on the photos, it was a comfortable place in which I didn't lack of anything. It's fine to accommodate 1 or 2 people, but too tight for 3 people in my opinion.
The bed was particularly comfortable and the kitchen well equipped !
The only downside I found was the sound isolation that was poor.
Thank you Kei for you quick responses and clear instructions :)