I have a family of 5 with 3 grown children. There was plenty of room for us all.
The location was great. The apartment is in Korean area with great food options.
Short walk from JR line and the metro and one stop away from major hub Shinjuku where you can shop, eat and explore.
The apartment itself was very clean. Naomi left us with an apartment manual that gave us detailed English instructions on how to use everything which was a big help. Even had TV set up for us to be able to watch things and play the Wii.
One complaint I have was the beds. They were not comfortable at all but the pillows on the other hand were very comfortable. Actually most comfortable of our whole trip in Japan and we stayed at 4 places/cities.
Overall our stay was great and I recommend anyone to try this location out if staying in Tokyo.