Considering the Hotel Alt Graz in Düsseldorf?
A VT member wrote the following comment about visiting Düsseldorf:
MuseumsBike by IceBear7
A fantastic new service offered by two big art museums (K20 and K21): if you buy a ticket for either one or both of the museums you can rent one of their bikes for free - to get from one museum to the next or do a spin around the city.
All you have to do is see one (or both) of the museum, show them your passport and leave a deposit of 20 Euro, and the bike is yours until you bring it back to one of the museums until 5 p.m. You get a map and a lock - and lots of attention at least at the moment, because the bikes are pretty new.