Advice please!

So, my partner and I are going to Prague and Vienna in the end of June for about two weeks. I have never been to Europe and am so, so, so excited. However, I know so very little about either place. Does anyone out there have any information about either of these cities? I've heard that there are pickpockets and aggressive gypsies. Any other helpful tidbits? I know that they are both in heavy meat eating countries and that it will be difficult for us to avoid it. Any tips for that? Our trip to Mexico City a few years ago, yielded us a "sin carne" quesadilla that had pork in it, among many other interesting meals.