This hotel is on one of the streets behind the Piazza di Spagna. If you like to shop, this is the ideal hotel: all the main shopping streets and brand-name stores are nearby. The only fault I can find with this hotel is that there is a bit of noise from the street.
The hotel is wonderfully luxurious and the rooms are the kind that you don't easily forget. I remember coming back from a day exploring Rome, opening up the door to my room and thinking "now THIS is the life!" The service, as you can imagine, is outstanding and what you'd expect from a hotel of this category (and price). It's not ideal for every kind of vacation, but if you have the money and it's a special occasion (I'm thinking honeymoon), then it's the best place in Rome.