By public transport:
Approximately 1 hour, 20 minutes: Take the Piccadilly line towards Cockfosters and get off at Green Park station. Change to the Jubilee line and take the train towards Stanmore for 3 stops to North Greenwich Station. From here, you can either take the 422 bus for 1 stop to Tunnel Avenue, or walk directly to the hotel.
By taxi:
Approximately 70 minutes at around £100