Where is the best place to stay in Seoul's beauty district?

Hi, this is Nana. I'm planning a beauty trip to Seoul next month, and I was wondering which areas everyone usually stays in?

I know there are lots of beauty clinics in areas like Gangnam-gu and Myeongdong, but I'm wondering which area is actually the most convenient... Considering access, nearby cafes, walkability, and everything else. Haha.

Where do overseas users usually stay? Is it usually near Itaewon or Gangnam Station? Or are there other hidden gems? I'd like to minimize travel between treatments, so I'd appreciate any advice.

Also, I'd love to hear real experiences from people who have actually been there. Thank you!