Tennis Stadion is a very well run tennis center in central Stockholm, offering both indoor tennis…read moreand badminton courts, as well as outdoor courts during the non-winter months. The courts are great, changing rooms always clean, staff exceptionally helpful, and a pro shop next door. You can book online once registered, though its all in Swedish (note to self: learn Swedish. Soon.) I've only ever had lessons and coaching with Rahim, who is terrific and whom I highly recommend.