My family has been staying here for over 15 years. To me, it is the best hotel in London. The location is great (with its own private access to Green Park), the staff all that you could ask for (they take time to know everyone's name and what their preferences are), the rooms are wonderful (I prefer the Carriage House annex to the main buliding).

Some may decry the lack of amenities (there is no gym, pool, etc), but that's fine with me. This is a hotel with charm and class.

Is it expensive? Absolutely!!! Is it worth it? Yes (especially if you do not have to pay)