This apartment is about 5-8 mins walking from a Keio New Line station, which is very convenient. There are lots of restaurants around that are quite good and there seems to be a lively nightlife scene in the area. The apartment is not in the middle of a big city like Shibuya or Shinjuku, so proper care should be taken walking alone at night if you're a woman.
This apartment is inside an open-air apartment building. These are common in Japan, and it means that the hallway to the building isn't completely enclosed like you might expect. This usually is fine, but this apartment is also right next to a very busy highway. Even inside the apartment with the doors and windows shut, it sounds like you're outside all the time, at every hour.
The apartment itself is fairly nice if a little quaint. It's not huge by any means, but we found it bigger than most apartments we've stayed in Tokyo. You might not want to leave your suitcases open the whole time, though. All the expected amenities are provided. We weren't completely satisfied with the cleanliness of the room, but it wasn't dirty by any means.
Our least favorite part of staying here is that this apartment seems to be run by a company, and not by an individual. All communications came signed by a different person, and there wasn't anything very personable about the experience. Honestly, if I wanted to not talk to or connect to locals, I would have stayed at a hotel. Due to it being a company, some of their policies were not very hospitable to the guest either. The checkout time was earlier than most hotels with an exorbitant fee for late checkouts, citing that they had to pay their cleaner to wait. This didn't make sense to me, as they also asked me, the guest, to try to clean up as much as possible before I left.
A lot of these things weren't so bad for us because we were only staying for a few days before our flight home, but I would have been much more upset if I had planned my entire stay in Tokyo around this apartment. We're not really that picky and we come to Tokyo at least once a year, but enough things were off the mark that I don't think we'd stay here again.