Hey people,
for those of you who are looking for a nice online gerber view, I can recommend AISLER:
https://aisler.net
You can either upload the gerber files, but they do accept also right away eagle-brd.-files which makes it very easy to visualize it.
Prices seem a bit expensive. But anyway: for visualizing the PCB this is the best tool I’ve ever seen.
Best,
Chris
Ohhh seems good! They say “German manufacturing” 
And visualizer is better than osh-park. I tried the board which was faulty at OP and here I can see the errors
Did you try them?
It’s a bit more expensive but a good compromise between OP and Eurocircuit for prototype.
Thank you.
Best regards
Bruno
Dear Bruno,
no I didn’t try them.
Actually they are located in the Netherlands as far as I know.
I order all my stuff at elecrow in China. Fast, reliable and very cheap.