"They heard a bang and tried to put it out but when they couldn't called the fire brigade."
He said the blaze appeared to have been brought under control quickly.
"There's a lot less smoke than there was 10-minutes ago which hopefully means they have got it under control. It looks a lot calmer now no one is running around."
It was the first fire at the well-known café, he said.
"You can see inside form here and there doesn't seem to be any damage in there I think because it's inside the walls it might have gone up a little bit.