It's not beautiful or crafted but it doesn't have to be. It's good that it doesn't feel mass produced, gawdy, loud and plastic.
The sign's fine, it's feels handmade, friendly and personal which makes me feel that the coffee shop will be similar. Hopefully that's the case, otherwise the sign is wrong.
it is a shame that it's situated in a corner that you have to go back on yourself to go onto the platforms. It would do much more trade if it either opened on the front of the station, or onto the platforms themselves.
if you've gone through the gate, and then realised that the train is 6 minutes away, most people won't bother to go back out of the gate, and round to get coffee, and back round to get in, but if the entry to the cafe was nearer the front, one could see if before going through, and possibly they'd get more trade. Or as I suggest, a window/serving hatch onto the platform.
I'm sure they would do it if they could. Or perhaps they are already looking into it.
The issue is that the serving hatch will be on the left as you walk through the gates and LOROL have tough guidelines for what signage you can use on their stations. I'm sure there are solutions.