Casa del Papa is largely dedicated to Ernest Hemingway, who was hospitalised near Ljubljana when fighting on the Italian front during the First World War. Therefore, the Key West bar is decorated with many photographs of Hemingway (usually indulging in his twin hobbies of fishing and hunting). The Key West bar is like a mockup of an African hunting lodge, with lots of cane furniture and animal-print fabrics.
Casa Del Papa also has a restaurant serving vaguely Spanish food and a Cuban bar that often puts on bands or has discos. Both are open until the early hours. The Key West bar offers tapas, but this is much removed form Spanish tapas, although it does tasty cheese plates, salads, and meat plates. These are not such good value as eating in the restaurant.
Casa del Papa attracts a mixed crowd, generally young and stylish, but this is not an expensively exclusive joint. A little way out of town, it seems to attract locals from the nearby flats. My favourite time to go there is on a Sunday afternoon after a good walk in Tivoli Park just across the road.