If you scroll to the 'key info' section on the listing it will provide access information including which floor the entrance to the home is on and whether or not there is an elevator:

You can also check the amenities for 'lift access':

To search for homes with minimal or no stairs click on the ‘filters’ box on the top right-hand side of the search page:

You can then select if you would like step-free or fewer than 8 steps and click 'update results:

For any other questions such as the dimensions of the elevator or the exact number of steps please contact your host.