I had no problem with (regular) stairs after my single-stage procedure. For safety I'd suggest you make sure the bannister is secure!

May be best to plan on having your bed and bathroom on the same floor for the first couple of weeks.  As for stairs it all depends on how soon you recover and when your last pain med was taken, you will just have to wait and try things out for sure you will not be able to climb at the rate you use to but just take it slow and you will be fine.

If you can do stairs now (pre-op) there should be no reason you can't do them post-op.  Keep in mind that you might have to move quickly to the bathroom so convenience will be your only worry.

Depending on pain tolerance for yourself also.  I did minimum stair climbing at first just because I wasn't sure how I would feel, but when I did, I actually did it "Toddler Style" by sitting on my bum going up not down...going down wasn't difficult but coming ups was better to take each step on my bum.  Silly to some...but worked for me!!!