Student or Learner
A woman came to London. She walked into a building and had to go upstairs.
She climbed a flight of handsome stairs, one less handsome, and then a set that was steep and narrow.
I understand that she climbed a group of stairs and then another group of stairs.
First the stairs were "handsome" (what does it mean here? Big?) and then less "handsome" and then they became "steep and narrow".
Handsome stairs would be imposing/architecturally eyecatching/graceful, like these: