In my top ten places in London. Pop in for an espresso and a nata (custard tart) and sit with your back against the window and watch the constant stream of customers. You won't be able to resist trying another cake as the selection is outstanding. Then you'll probably stay for a ham and cheese roll when you see that this is what the regulars are eating with their milky coffee. My week isn't complete without a trip here. Stock up on tinned fish and other Portuguese specialities while you are there.