It's old-fashioned in a good way. Not quite Grandma, but close enough to be fun.
Strong black accents in the chandelier and chinoiserie chairs give the room some edge. Contrasting paper on the ceiling reinforces the bold gesture of pattern on pattern.
Wallpaper can get a little expensive, but you could create this look with a stencil and some patience. Choose a star pattern or a little blossom, and paint it in a repetitive pattern over your existing walls for an instant update.