A nice and clean apartment right next to Kōenji Station. There are lots of restaurants and bars nearby. (Keep in mind that that also means that it's always rather loud outside.) You can reach the train station and a 24h convenience store in about a minute. A bigger supermarket is even closer, but that one closes at 9:30PM and it's pretty cramped in there.
There are two entrances to the balcony, one of which is unfortunately blocked by a double bed. We were surprised by a second toilet; both of them are high-tech with seat heating, automatic ventilation and a bidet function. Sadly, the single-ply toilet paper can't keep up.
I guess it could be cold in winter, because there is a window and a vent that can't be sealed properly in the living room.
The two double beds only have one bigger blanket for two people instead of one for each person.
It also has a really nice shower with good water pressure. Don't forget to turn on the thermostat in the kitchen, because you won't have warm water otherwise.
The front-door has a code-lock, so you don't have to worry about keys. That led to a small problem though, because I received the code when I was already on the way to the airport, so I had to check my e-mails at a local karaoke bar's Wi-Fi. (I received it roughly 1,5 days before check-in, but it was a really long flight and we also arrived 8 hours before check-in. I could've checked my mails at the airport, but I didn't even know there was a code.)
I guess you can see the rest by just looking at the pictures. We really enjoyed our stay and can definitely recommend it to anyone who doesn't mind the loudness and the single-blanket beds.