Which area did you all stay in for your beauty trip to Seoul?

Hi everyone! I'm Lan, and this is my first time planning a beauty treatment trip to Seoul. I'm a little excited but also a little overwhelmed, haha. I've heard that Gangnam and Apgujeong have a lot of clinics and a more international atmosphere, but I'm not sure which area is best to stay in. I'd like to ask you all, where do you usually stay when you go to Seoul for beauty treatments?

I've read a lot of travel guides online, and Gangnam seems very bustling, but I don't know which street or neighborhood is the most convenient. Also, is transportation convenient there? Is it particularly expensive? I'm looking for a place that's convenient for finding medical beauty clinics but not too much of a hassle.

Also, I'd like to know if anyone has stayed in both areas and could share their experiences? For example, are there any good restaurants nearby? What's the environment like? Is it safe? I plan to stay for five or six days and want to experience local life in Seoul, haha. Experienced ladies, please share your tips!