The staff were all very accommodating in every language. I can speak Korean, but for more complicated conversations, I do default to English and they were able to handle that no problem.
We did have a little bit of a hiccup during check-in: If your legal name is Korean, they may end up putting you into their system in Hangul using your Korean name. This is what happened to me and so when they were trying to find my reservation in English, they couldn't find it. But when they looked for my name in Hangul, there it was.
The room was spacious and clean and the location is very convenient, but the air conditioner was busted for our room so it got VERY warm at times and that was a bit uncomfortable to sleep in. Since we had a very short trip and a very busy itinerary, we didn't check out any of the other hotel amenities, but we had a comfortable stay otherwise, so no complaints.
There's a very convenient airport bus that goes straight to and from the hotel to Incheon, so that was also a bonus.