It's about time that the local young people in Zakopane have a trendy place to hang out, and the people at STRH got it spot on. Nice interior, relaxed atmosphere, great coffee and cakes and a good selection of light snacks.
As you will find yourself in Krupowki street either way at least once on your trip to zakopane, you'll need a place to rest your feet. It's on the 4th floor so you can have a coffee and cake and watch the rest of the tourist walking about in Krupowki, feeling slightly above it all and smug knowing you've got the best spot.
Try any of their cakes, they are amazing.