We have two suggestions. Make a comment in your description about the number of stairs that need to be climbed to get to the apartment. For someone who has difficulty with stairs, a few stairs might not be bad, but there are numerous stairs when you consider the many times people will be going in and out.
Also, the bottom step of the staircase leading from the bedroom to the living room needs some type of reflective tape or something similar to alert people that there is still one step ahead. My husband slipped on the step the first night we were there, but was able to keep from falling completely, whereas the second day, I fell all the way to the floor from that step and injured my knee. People need to be alerted to that unusual last step.