In my opinion the country doesn't look nor feel like eastern Europe at all! It definitely felt more similar to Germany than Ukraine or Belarus to me.
What makes it cool i'd say is that while it is doing better than the rest of the ex-communist states, it's still not fully westernized. Thus, being at that happy-medium stage. It's not fully modernized and some remote areas can look a bit rough, but at the same time, the central parts of the cities are lovely and very charming.
I kind of like the contrast between old and new, but am not sure for how long it's going to remain like that...