The Max Huerzeler hire company have a unit on the hotel site for hiring and servicing bikes. They cater for most people. I am not certain about the smallest size they can provide. If you private message me with your height and normal bike size I can find out for you. I think in the past some people have arranged particular hire from other providers, which may need to be picked up yourself. I have managed to find a company that will hire me an e-bike like mine and deliver it to the hotel!