I stayed at Shin's place with my spouse and infant for about a week over the New Year holidays. The location was great for us - not in a super busy area but also only a 3 minute walk to a subway station that was able to connect us to wherever we needed to go. There was also a 7-11 on the corner that we ended up going to at almost every day for water and snacks.
The apartment was just the right size for us and had everything we needed and more. We appreciated the comfy full sized bed, basic toiletries (soap, shampoo, and even conditioner), electric kettle, small fridge, and house slippers. Oh and the pocket wifi! That was an invaluable part of making our trip stress free was that we were able to bring it with us to have fast wifi throughout the day; we even used it to charge a phone when it had a super low battery. This apartment has a washing machine on the balcony, which is a plus. However, we ended up using a laundromat nearby because they had dryers available. We had been traveling elsewhere before we got to Tokyo and had lots of dirty laundry that we wanted to get done quickly; otherwise, we would have utilized the washing machine at Shin's.
The communication with Shin was top notch! I would say that Shin replied to all of my messages within 5 minutes (at the most) and was very good at giving detailed instructions for check in. His check in/guide book binder in the apartment was also invaluable because it had instructions for the A/C/heater, pocket wifi, laundry machine, microwave... basically every device in the apartment. You can tell Shin put a lot of thought into having lots of amenities and helpful tips to make your stay great. Shin, thank you very much and happy new year!