Which areas in Seoul do foreigners prefer most for beauty treatments?

Hiii, I'm Liên, and I'm planning my first trip to Seoul for some skincare treatments and possibly a few other things. I've heard Gangnam and Apgujeong are very popular for this, but I'm not entirely sure, so I wanted to ask you all for your thoughts.

I'm curious if any of you have a favorite area to stay in? The thing is, I need to find a place that's close to clinics/spas (or whatever they're called 😅) and also has decent, not-too-expensive hotels or guesthouses. I'll only be staying for about 5-7 days.

Has anyone been before and can share their experience? Which area is easy to get around, has plenty of food options, and is close to beauty facilities? I'm a bit overwhelmed with all the choices 😭 Thanks in advance!