Beauty trip gone wrong? Where should you stay in Seoul?

Hi, it's Hana! I'm planning a trip to Seoul next month for beauty treatments, but I'm unsure where to stay 😅

I've heard that Gangnam and its surrounding areas have a lot of beauty clinics, but is that really the case? Also, considering a balance with sightseeing, which area would be convenient... I'm wondering. Are there any foreigners who have stayed somewhere and thought, "This was the best!"?

I'm also interested in things other than beauty, so I'd be happy to get recommendations for cafes and places to eat. This is my first beauty trip to Seoul, so I'd really appreciate any advice from my seniors 💕 Please let me know if you have any recommendations!