There is a real nice cafe, Java U, on Praed Street, it’s a place I either visit just after I arrive at Paddington or whilst waiting for a train from Paddington.
There is always a lovely warm welcome and the coffee is excellent.
There isn’t a huge amount of room inside on the main floor, but there is a basement which has a lot more space.
The last time I was in London was at the beginning of March, so I’ve not been since then. I am looking forward to the time I can go back and have a nice coffee.