Want to go to Seoul for a beauty trip, but not sure which area is best?

Hey everyone! I'm Cantika from Indonesia, and I'm planning a trip to Seoul next month specifically for skincare treatments and aesthetic stuff. But I'm still confused about which area would be most convenient to stay in.

I've heard a lot that Gangnam and Apgujeong are beauty hotspots, but I've never been there. So which area actually has the most treatment options and clinics? And in terms of hotels or guesthouses, which ones are more comfortable and close to the treatment places? I prefer somewhere within walking distance or a short metro ride.

For those of you who've been to Seoul or live there, do you have any favorite area recommendations? Has anyone stayed around those areas and can share their experience? I'm also curious if there are other great areas that might be less mainstream. My budget is medium-range, so I'm looking for something reasonable but still good quality.

Thanks in advance, girls! Looking forward to hearing from you!