Royal Library in a palace in Vienna.
No, I'm not in Europe, but a friend is, and he provided this picture of a library in Budapest. I googled "Budapest Library" and found that there are several; I haven't figured out yet which is the one pictured. But it's fun to look around the library websites, especially since they have "translate this page" buttons!
OK, I got spoofed with this: It's actually lounge at the Sofitel Hotel in Budapest. Still neat. Perhaps my traveling friend will come through with a real library picture before his trip ends.
Minor update: The hotel concierge says that books can in fact be borrowed here...so it is both a lounge AND a library.