I am 67 and walk the bike up the stairs holding the handlebars. I do up one or two steps at a time and then apply the F&R brakes, then go up the two steps while still keeping it locked, and walk it up two more, do it again. When I get to the landing, I lock the rear wheel and pivot the bike vertically and turn to the next set of steps and go again.

Our basement steps have 8 steps, a landing the 8 more steps in a zig-zag. I have used this technique since college and city apartment days.

Advantages, no marked walls, no marked floors, no falling, and bike can be lightly loaded.

To go down, I lock the rear wheel, pull it upright, and walk it down on the rear wheel using the rear brake.

During the biking season, the bikes stay in the spare bedroom, unless guests come.