The requirements that guests with restricted mobility have on accessible rooms vary from person to person. The online portal roomchooser.com helps with the search for suitable rooms in Vienna.

The guest selects a destination and specifies their personal "must haves" using a checklist, e.g. wheelchair accessible washbasin or wheelchair accessible shower enclosure. Only those hotels that meet the desired criteria are displayed. A special bonus: The rooms can be viewed, as all registered hotels provide photographic material. Once the guest has reached a decision, they are forwarded to the hotel with just a single click to check availability and make a booking.

You can find further information here