Two fire engines and 10 firefighters and officers were called to the fire in an end of terraced house which had been converted into flats.
A small part of a five-roomed flat on the lower ground floor was damaged by the fire. A woman was rescued by crews wearing breathing apparatus. She was treated at the scene for smoke inhalation by London Ambulance Service crews.
Watch Manager James Cartwright, who was at the scene, said: “There were working smoke alarms throughout the property which alerted a neighbour who called us.
“Crews quickly got into the property and rescued the woman. Without doubt the quick actions of the crews saved the woman’s life.
“It was very lucky the neighbour heard the alarms and called us when they did – a few minutes later could have made the difference. The crews worked really well and got the woman out quickly.
“This fire should serve as a reminder of how important it is to have working smoke alarms throughout your home.
“Fires can start in any room and homes need multiple smoke alarms which should be tested regularly. They should be fitted in your hallways and landings and in any room where you smoke, use candles, incense sticks or portable heaters and leave electrical equipment on or on charge, such as satellite boxes, heaters, computers and mobile phones.
“A heat alarm should also be installed in your kitchen.”
The Brigade was called at 1408 and the fire was under control at 1505. Fire crews from Islington and Kentish Town fire stations attended the scene.
The cause of the fire is believed to have been an electrical fault in a toaster.