Location, location, location! This is just a really convenient place to stay, especially for first-time visitors to Tokyo like us.
As many reviews have stated, the apartment is easy to access from one of the largest train/metro stops. The neighborhood is lively and full of great stores and restaurants, and a full 23-hour supermarket is just minutes walk away.
Communication was proactive, thorough and easy. Everything worked as advertised, so we didn't need any help during our stay, but I'm sure it would have been forthcoming.
Just a few suggested improvements: the listing doesn't mention that the apartment faces a busy motorway and has just single-pane windows. It's pretty noisy at night if you are a light sleeper, so bring some earplugs. Also, while the listing photos are quite accurate, from those photos you don't get an overall sense at how small the apartment is. It would be great to have a floor plan as one of the photos so that expectations are set right from the start.