Question! What's a good area for a beauty trip + convenient accommodation?

Hello! My name is Bua, and I'm planning a trip to Seoul soon. I'm a bit stuck on which area to choose because I also want to get some beauty treatments done 😄. I've heard these areas have many great beauty clinics, but I'm not sure where to start. Does anyone have experience with this?

My friends told me Gangnam and Apgujeong are excellent for this, but I'm wondering which area is actually more convenient for staying? For example, transportation, finding food at night, places to eat, and reasonably priced accommodation? I'm thinking of going for about 4-5 days.

If anyone has been to these areas before, please share which area you would choose and any tips for international travelers like me 🙏. Thanks in advance!