ESNcard holders get 30% discount on guided city tours on electric scooters - 25€ per person for a group of, at least, 4 people. 

Also you get a disscount for electric scooter rental:

4,5€ per hour for a rental period of less than 3h

3,5€ per hour for a rental period of 3 to 6h

3€ per hour for a rental period of 6 to 8h