Where is the best place to stay for a beauty trip to Seoul?

Hi, this is Aya. I'm planning a beauty trip to Seoul this fall, and I'd love to hear your recommendations...

I've heard that Gangnam and Apgujeong have a lot of beauty clinics, but what's it really like? Also, are there any areas that are easy for foreigners to walk around? I'm going alone, so I'd like to be close to a place to rest after treatment.

Furthermore, which area is convenient to stay in? Should I stay near the clinic, or near Seoul Station or a major station...? I'm undecided. This is my first time in Seoul, so I'd love to hear about everyone's real experiences. Any advice would be greatly appreciated!