It was a decent stay. We had the Family Suite, which was slightly outdated and has seen better days. There were also a few dead mosquitoes that had previously been splattered on the wall; no complementary toothbrushes or toothpaste either (we always pack our own Anyway).
Nevertheless, The room was large, bathtub was nice, sofa and beds were comfortable. No real issues.
For an average of ₩75K (£50/$64) per night (four nights; including the weekend), one cannot complain.
I also had the opportunity to peek into other rooms that were being serviced after early checkouts, and they actually looked in much better condition.
I'm guessing that the larger suites take longer to clean, aren't booked as much as the smaller rooms, and are therefore subject to decline and less upkeep.
My advice would be to not book a suite, but to go for a general or deluxe room (if you could live without a bathtub).