Where to Stay for Your Seoul Beauty Trip?

Hello everyone, I'm Hina. I'm planning a beauty trip to Seoul this fall and wanted to ask for recommendations on which areas are best. I've heard of Gangnam and Apgujeong, but what are they really like?

Of course, I want to get treatments, but at the same time, I want to enjoy the area's atmosphere, food, and cafes. Is Gangnam crowded because it's so famous? What about Apgujeong? I'd love to hear from people who have actually been there.

I'm also wondering which area is most convenient to stay in. Should I book a hotel near where I plan to get treatments? Or would it be better to stay in a different area to enjoy sightseeing? What's the travel like for round trips? I'd really appreciate advice from experienced travelers, including budget and travel time. Thank you!