In my travels around Europe I always try to find a place that uses Bitcoin when I visit. When I was in Amsterdam in the fall I went to one bar and had a beer because they accepted Bitcoin. When I asked to pay the waitress had to ask the bartender, the bartender pulled out an iPad from under the bar. It was dead so he needed to charge it up to get it going. I don't remember what the final outcome was from the iPad but he couldn't get it to work so I just paid in cash.
I went to London for a Bitcoin conference and there was only one Bitcoin place in the area, a hamburger restaurant. I couldn't really tell if it was at a location or if it was a lunch truck. It was not open on the weekend that I was there.
In Vienna the restaurant near the hotel accepted Bitcoin but it was a very high end restaurant with a long waiting list and the food they served was not all that appealing to me anyway so I did not try it.
I did find a great bar in Budapest (
http://www.ankerklub.hu ) that I was able to pay at the bar in bitcoins and they even gave me 10% off of the bill for doing so.
In Milan I went to a pizza restaurant run by a Chinese family that accepted Bitcoin. I had to help the guy a little bit to show the cashier how to use his BitPay app.
I might go to Belgium this month, I heard something about Bitcoin in one of the towns there. I'll have to check it out.
No definitive hub yet that I have seen.
I would like to be able to go to a tourist town and say I have only bitcoins, give me an itinerary for the weekend where I can eat, sleep, buy a few souvenirs and do a few tours paying for each place with bitcoins.