Getting to your hotel from Gatwick Airport:

By Train

The fastest train service into Central London is the Gatwick Express which travels direct to London Victoria station and operates seven days a week. Trains are non-stop and run every 15 minutes from 06:00 to 20:00 and every half hour between 04:30-06:00 and 20:00-00:30, with a journey time of 30 minutes. A single fare costs £11.00 and must be purchased before boarding the train. Connex South Central and Thameslink also run a service from Gatwick, with a slightly longer journey time of 35 minutes. There are four/five trains per hour, Monday to Friday, with an hourly service overnight.
For information on these services call the National Rail Enquiry service on 08457 48 49 50.

By Taxi

Journey time to central London is 60-70 minutes, at a cost of approximately £50-£85. To avoid the inevitable queues for taxis, you can book your taxi in advance through Black Cab London. No waiting charges are incurred as all flights are monitored by reservation staff. You will be met outside the customs area by your driver who will assist you in carrying your luggage to the vehicle. Black Cab London can also arrange your return journey at the time of booking.
You can contact Black Cab London on 0800 169 5296 from the UK or 1-877 405 7622 from the USA.