We stayed at Sayoko's place for just over three weeks, and for two people it is the perfect size. The bedroom has a sliding door which means that you can separate it from the kitchen area when you cook which is great! The washing machine was very helpful, and there are a few coin laundry places nearby that you can dry your laundry at. Local amenities were also very good - there is a Lawson about 20 seconds walk from the apartment, and the bustling street of Togoshi Ginza is also well worth a visit for food, shopping and entertainment. Osaki station is very close, about 10-12 minutes walk, with JR Yamanote line access as well as Haneda Airport Bus access.
The only cons of our stay was that we unfortunately experienced some noise issues from the upstairs neighbours whilst staying, which kept us from sleeping, however Sayoko was able to mediate this for us. I did also find that the apartment was not entirely sparkling clean, but both of us hoovered and tidied the apartment on a daily basis to ensure we kept our living spaces clean and tidy. Sayoko is a great host and very responsive and kind, and we would like to stay with her again in the future!