How do I get to my hotel in London using the underground?

I'm going to london by the Eurostar and I need to get form St. Pancras station to the Montana Hotel (67-69 Gloucester Rd, Kensington, SW7 4PG London ) in Kensington by underground. Stpe by step directions would be great! Thanks a lot!

Leilani's answer is completely wrong - taking the Hammersmith and City Line towards Liverpool Street won't take you anywhere near Gloucester Road, it's completely the wrong direction.

Instead, get the Piccadilly Line westbound (towards Heathrow or Uxbridge) and get off at Gloucester Road. You don't need to change, luckily. The hotel looks to be directly opposite the exit from the tube station, just cross Cromwell Road.

Get the Piccadilly line to south kensington form Kings cross station (2 min walk from St Pancras). Gloucester road is about 5 mins walk from there.You could also e mail the Hotel and ask for the quickest route from St Pancras to them using the underground.