Thanks for you post!
Regarding your plans - I think you and your wife should feel safe to visit us! I don't know how it looks in media, they sometimes exaggerate, but in reality racism is really marginal in Poland. I suppose it's also consequence of Poland being still quite homogeneous country, we have very small minorities and (paradoxically perhaps) there is no racial tensions here.
We have ~38 million people and I suppose you can find at least one example of every possible behaviour or crime, of course, but I bet racial crimes rate in Poland is one of the lowest in Europe. Also risky districts are also quite rare in Poland. In most of European countries you should be aware where are you walking after dark. There is no such contrasts in Poland, at least not as sharp.
Greetings for you and your wife. Good luck with financial matters and see you in Poland someday, I hope! ;)