I stayed a week at this hotel as a Diamond in September 2024.

Was upgraded to a king suite which wasn't very big, small couch and small table. Also received two drink coupons for use at the cafe in the lobby.

The cafe has coffee, pastries, beer, wine, whiskey and a few cordials. The employees rotate working the desk, cafe, and restaurant.
Often the employees working the cafe had no idea how to make cocktails so I had to teach them.

No EL at this location.
Breakfast was provided at the restaurant on the 3rd floor which was decent for this price point. I did spend some money to try the Dinner buffet and for the money (in Korea) it was good. Free beer, wine, steaks, etc.
They have a nice coin laundry room setup on B1. Fitness room is located at the top floor and pretty small. On the roof they have a small pool that overlooks the city, I never swam it but did go up there for fresh air and drink a beer.

Location is close (2min walk) to the subway station and is in central Gangnam so it is possible to get anywhere.