Simply Schedule Appointments
This is a powerful WordPress booking plugin that is known for its 5-minute setup wizard and well-organized dashboard.
Simply Schedule Appointments may be the ultimate bookings plugin for users who are bent on usability.
It is highly rated on the WordPress plugin repository and offers a capable free version so you can get an impression of how the plugin works before considering the premium version.
Simply Schedule Appointments also has a very active support team and is incredibly affordable when compared to Start Booking.