we spent 5 days and 4 nights in 45 park lane last week. business + pleasure. the hotel is great fun. although it is brand new, which means you have almost every gadget possible in the room, its decor is warm and inviting. what is more inviting is the team, who go out of their way to please you and to provide every request 24/7.
add to this a great location, which facilitates an early jog in the park and a "green" view from your room and from the breakfast table, and the cut restaurant, which serves great steaks, and you receive a great complete package.
will definitely return.