We stayed at room 503 for 11 nights and it was so worth it. I was with my husband and my 1 year old son and the unit was very spacious. I loved that there were storages for everything. So the space was actually used by my son for running and playing around. we had with us a total of 4 large suitcases and 1 small suitcase and still it was very spacious. Although we enjoyed going out a lot, we were always happy coming home to the unit because it spelled comfort after a day's activities.
It was also easily accessible from the subway or JR Station. The JR Station route was more interesting because there were lots of restaurants near the station, but the route from the Subway through Morishita Station exit also felt nearer. So it was really a toss up between the two.
When we come back to Tokyo again (hopefully this year), I would love to stay at StayMe's unit again. It was perfect and exactly described as the photos.