1 appliance is currently on scene with firefighters commited to the property above iFix Local.
Residents have been evacuated and the area cordoned off.
Other appliances are struggling to reach the scene due to a number of vehicles stuck in the one-way system.
Union Street is currently closed to all traffic.
The alarm was raised at 17:45.
UPDATE @ 19:25 – The fire in the kitchen has been successfully extinguished and crews have now left the scene.
No one has been injured as a result of the fire.