The JustBook Hotel Circle. Exclusive hotels. Benefits included. The JustBook Hotel Circle offers only top-rated hotels in Europe and the US on last minute rates. Earn Lufthansa Miles & More miles with every booking! JBM JustBook Mobile is the new innovative provider of smart-phone-based hotel bookings. The start-up company was founded by a team of experienced managers and founders and provides revolutionary applications for the distribution of tourism-related services in all of Europe.