Stayed 2 nights with wife and teenage daughter.
This is a studio apartment with a kitchenette and washer, and a toilet/shower, and a loft over the toilet. It is conveniently located in the business district with lots of banks and office buildings, and within a few minutes walk from Jonggak metro station.
The owner provides clear detailed instructions to the apartment after we booked, and we had no difficulty finding it.
The place is clean, with 2 double beds which can sleep 4 persons comfortably. There's a loft with 2 mattresses which can sleep another 2 persons, but it will not be as comfortable due to the low ceiling. An adult can barely sit up.
Unfortunately, past guests have not taken good care of the premises and wear and tear is evident. The air conditioner doesn't seem powerful enough for an apartment this size.
If you're not very picky, this place is a decent place to stay for the price.