Depends what they're used to.

If they're used to staying in five star hotels in the Far East then I doubt it will impress - then again virtually every so-called luxury property in London IMO offers such horrendous value for money I've virtually given up bothering and now choose to stay in a fantastic 4 star.

If however they're used to British Hotels out in the sticks it'll probably meet their needs - I doubt they'll be bowled over however. It's difficult to get over that a lot of money buys you very little in London