Hello! I haven't been to Seoul in 10 years and am heading back for 4 nights (during the week) in April. Any recommendations of hotels (and things to see/do) would be greatly appreciated. I currently have Accor Gold status w/ an All Plus Voyageur Card:

Parameters (somewhat flexible) are:

$100-$125 a night (can go a bit over this for a top-notch Accor)
Upgrade experiences & approximate odds
Breakfast insights given my wife is vegetarian
Area: Myeongdong looks ideal but am open to other areas given how good public transport generally is in Seoul
Properties that have stood out: Ibis Styles in Myeongdong & Gangnam, Mondrian Itaewon, Ambassador Seoul (Pullman), Mercure at Magok (next to Gimpo Airport).

Any and all information and recommendations would be greatly appreciated. Merry Christmas & Happy Holidays!