Four fire engines and 21 firefighters and officers were called to a fire at a flat in Langham Street in Fitzrovia.
Part of the lounge of a first floor flat was damaged by fire. One man left the property before the arrival of the Brigade and he was taken to hospital by London Ambulance Service crews.
The Brigade was called at 0959 and the fire was under control at 1101. Fire crews from Euston, Soho and Paddington fire stations attended the scene.
The cause of the fire is under investigation.