Finding good areas in Seoul for a beauty trip + suitable accommodation

Hello! My name is Bam, and I'm Thai. I'm planning to visit Seoul next season to try out some beauty treatments, possibly for two trips, but I'm still unsure which area to choose 🙏

I'd like to ask those who have been before: what are areas like Gangnam and Apgujeong like? What's the atmosphere, the crowds, and the convenience? Also, are there good accommodation options nearby that are affordable and comfortable, yet not too far from clinics?

Also, could you give me some advice on other areas in Seoul that would be suitable for foreigners like me who are interested in beauty treatments? I'd like my accommodation to be within walking distance, and I'd also like to experience the local culture a bit during my free time, hehe. Thank you! 💕