Well, fun's the right idea with those. I wouldn't want to be responsible for advising anyone to buy one with necessarily any other priority in mind: (
) you can also get into Mamiya for not much more, as well as the good old TLRs, but those Kievs have their charm appeal, if they work.
There are a site or two out there for Russian camera fans: I always thought it'd be a fun idea, though not always a very practical one,
(IIRC, I was considering them as a way of getting my hands on a 45 degree finder when my MF work was shaping up to be more important than it is presently. )
...treat it in the spirit as if you bought a strange old car from overseas: call it a nice surprise if everything works. These sites will also be a place where you can find some repair service and instructions and the like, or a place to sell back out of the stuff, possibly, if the 'charm' is too much for you.