Jack's place is quite amazing. The space is really nice, I had room for everything I needed. Internet was fantastic, and everything worked in the apartment. The location ended up being better than I could've hoped, as it is on two subway lines. One is an express, and is direct to the airport (Gimpo, but Incheon is literally one transfer of 5 feet). The other reaches Seoul Station, which makes traveling around South Korea quite easy. The apartment is also quite literally ON the subway line, so very convenient.
Since the location is mostly filled with students, there's a lot of cheap, great food. The building itself has a few restaurants that are open 24 hours, and there's multiple streets 5 minutes away that are full of restaurants, still cheap. The only thing missing from this location is shopping, but with the subway being so easy it's not difficult to get to Gangnam or Myeongdong.
Jack was super easy to communicate with, and was very helpful. He met me in the subway station and helped show me around, even provided a folder full of information I would need about the AC, washer, etc. He even brought me snacks, twice.
This is a great find for anyone wanting to stay in Korea.