Originally Posted by
bgriff
I would also vote for the Tube. Note that Hyde Park Corner station is a bit closer to the hotel but requires coming up to the street and then going back down into a pedestrian underpass (stairs only) and back up to get to the hotel. Green Park is a longer walk but fewer stairs, so definitely preferable if traveling with a rolling suitcase.
I always use the Green Park stop. I'll only use Hyde Park corner if staying at the IC or FS or Hilton Park Lane. I don't have a rolling suitcase, but just find it easier via Green Park.