Ladies, where should I stay when traveling to Seoul for beauty treatments?

Hi ladies, I'm Quynh from Vietnam, and this is my first time flying to Seoul for some beauty treatments. I've heard that Gangnam and Apgujeong are famous areas for beauty treatments, but I'm not sure if it's more convenient to stay around those areas or somewhere else. Have any of you been there before?

I'm confused because there seem to be so many different districts in Seoul, from Myeongdong to other areas. If I choose to stay in Gangnam or Apgujeong, will it be easier to get around and find beauty salons? Or should I stay near the more crowded areas?

Do you have any experiences you'd like to share? My budget for accommodation is moderate, not too luxurious but comfortable. Thank you so much!