Seoul Beauty Trip ~ Want to ask everyone about your favorite areas and accommodation recommendations

Hi everyone! I'm Jiaqi from Taiwan, and I'm planning my first trip to Seoul for beauty treatments. I'm a mix of excited and nervous, haha. I've heard that many people go for treatments in the Gangnam and Apgujeong areas, but I have no idea which of these two areas is more convenient for tourists. Are there any sisters here who have stayed there before and can share their experiences?

My biggest concern is not knowing where to stay. Some people say it's more convenient to stay near the treatment clinics, but I also want to experience the local street views and cafes. I'd like to ask everyone, if you were traveling for beauty treatments, where would you prefer to stay? Is the transportation complicated? My English is okay, but my Korean is really weak ㄒ_ㄒ

Oh, and can anyone share some tips for planning the trip? For example, how to make appointments, how far in advance to book, and what to pay attention to before going. I've seen many professional-looking sharing posts, but I'm just looking for some genuine advice! I hope to meet like-minded friends~