Seoul Beauty Trip - Which district do you all live in?

Hi everyone! I'm Liyun from Taiwan. I'm planning a beauty trip to Seoul next month and would like to ask for your opinions. I've heard that there are many beauty clinics and cosmetic surgery places in Gangnam and Apgujeong, but honestly, I'm not sure which area would be the most convenient to stay in. Has anyone stayed there before and could share their experience?

I mainly want to stay in Seoul for 5-7 days to experience the local beauty culture and maybe try some treatments. But my biggest worry is accommodation. I'm wondering if staying near Gangnam will be too expensive, or are there other nearby places that are convenient but won't break the bank? I'm also wondering about transportation; will it be inconvenient to get around?

If any of you have been there, I'd really love to hear your real experiences and advice! I'm interested in everything from the local environment and accommodation options to how you plan your itinerary. Thank you!