Can someone other than the person who made the reservation (such as a friend or acquaintance) use the bicycle?

The bicycle may not be used by or sublet (leased to) anyone other than the person who made the reservation or a registered user declared at the time of booking.
This is also prohibited under the Terms of Use.
Insurance coverage may be invalidated in the event of an accident, so be sure to register under the name of the person who will actually use the bicycle.