Which hotel is the best for first timer?

Hey everyone! I'm looking for some recommendations on hotels, as I'm considering a few options. I'd really appreciate any insights you might have! Just a heads-up, this will be my first trip to Korea, and I'll be there for 3 nights. Thanks so much!

1. Grand Intercontinental Seoul Parnas

2. Novotel Ambassador Seoul Yongsan

3. Grand Hyatt Seoul Hotel

4. Grand Intercontinental

5. Mondrian Seoul Itaewon

6. Grand Mercure Ambassador Hotel and Residences Seoul Yongsan

I'm also open to any other suggestions.