I live in Sadang with my parents and younger brother. Our home is less than 10 min walk to Sadang Station, from which you can easily access anywhere in Seoul such as Gangnam, Seoul National Univ. and Yonsei Univ. through line 2 and 4.
We have a spacey living room, a kitchen, 2 bathrooms and 3 bedrooms.
Nearby Sadang Stn has lots of pubs, Korean restaurants and also Grand Park.
I want you to have a great memory of Korea. :)