For a beauty trip in Seoul - which district is better to stay in?

Hello friends! I'm Yesui from Mongolia. I'm planning a beauty trip to Seoul later this year. I'm interested in the Gangnam district or Apgujeong. Has anyone been to these places? I'm curious about where to stay.

I won't say that I'm planning on getting beauty services, but it would be great if you could do some research on this topic. Where would any foreign visitors find the best place to stay during their planned trip here? Is there a place with good subway access?

In terms of budget, I'd like to start with a high-end place or a small one. Of course, what would you suggest if you stay in a traditional house or a small hostel? Do you have any friends who have experience with beauty trips in Seoul? I'd love to hear your advice!