If you don't speak Russian watch out. You can get by with just English but it is difficult. Bishkek is a fun place to go and there are a surprising amount of tourists if you know where to look. The city has beautiful Russian archetecture and statues.
I have heard that some areas are dangerous at night but had no problems personally. The locals made it very clear to me that I should avoid the rail system at all costs though.
There is a really cool circus near to the large WWII memorial, look for the wierd shaped building that almost looks like the large a UFO.