I think pretty much all high iso film is actually about ISO 800-1000, it's just designed to be pushed to 1600/3200. As for what it's like, well just expect heavier grain, it'll most likely render like Neopan usually does, you could always search for shots taken with the films you are using on flickr, pretty much the first thing i do when i want to know what a film looks like.
A small film SLR like a Olympus OM series or Pentax M series with a 50mm 1.8 barely looks like an SLR, in fact some of my rangefinders are bigger than the Pentax ME Super. If was in this situation though i'd take my Olympus Mju-II compact, quick, discreet, sharp lens, even the AF uses infrared beams or something so it works well in the dark.