Where's a good place to go in Seoul for beauty treatments? What kind of accommodation is suitable?

Hello! My name is Bua, and I'm planning a trip to Seoul next month for some beauty treatments. It's my first time! I've heard that Gangnam and Apgujeong are major beauty hubs, but I'm not sure which area to choose because I don't know how they differ. Can anyone offer some guidance? Or are there other good areas as well?

Regarding accommodation, I'm wondering if anyone who has been before thinks it's better to stay close to the clinics, or if it's better to stay in a different district and travel there for appointments, while also sightseeing? My budget isn't very large 😅. I'd appreciate some information from those who have been before! How many days are you planning to stay? What's the approximate price per night for accommodation? Thank you!