Stayed at Central last year, but 2 didn't disappoint. Two minor downsidea would be that there was a fire hydrant-ish object in the room that really got in the way, and there was only one elevator (actually 2 but they covered separate floors so one would have no choice, especially when crowded)
The room was smaller than what we got in Central, but actually better since everything (power outlets, fridge, safe) was closer, and A/C was controllable by a remote whereas in Central we did not have control over our room temp.
Staff was very helpful for our late night check-in and early morning check-out plus a taxi request, and surprisingly many staff members spoke good Japanese (I was fine with English and little Korean, but my mother only spoke Japanese)
All in all a good pick.