@nycman's words are a very good example of words needed rather than wanted.
About three weeks ago I twisted my right knee, and even without having to negotiate any steps, my quality of life plummeted.
I live in an environment that affords me the convenience of not having to negotiate steps for anything (other than the recent city-wide power failure, which stalled all the elevators on the very day I had an unusually large grocery delivery, which I had to jackass up four flights of stairs in about eight trips. A story for another day.) I'm truly thankful it was before my knee injury.