The apartment is bigger than it looks in the pictures. Perfect for a couple. Clean, well maintained, safe and with lot of useful information. As Westerners we found the tatami floor to have a strange smell but we later discovered that every tatami room have the same smell :)
It is located about 10 min on foot from subway station (JR pass not valid on this line) and within walking distance from supermarket, shops and restaurants. Overall we had a great experience and we'd recommend it to anybody traveling to Tokyo.