Well, I'm going to get more detailed about it later, but as a base, technology-wise, you're better off thinking Victorian-era technology. Electric guitars are the exception, because technology has advanced enough to allow for their existence - but only as far as their creation goes. So, there are amps, and there are sound systems, but no cameras - and by comparison to what one would THINK of an amp, their look is ancient and bulky at best.
Dystopian is a good word to use in this regard, but in some ways, you're better off imagining the world as depicted in the Vampire Hunter D novels, but with less technology.