Unable to answer "What’s the height of this curb?" – Curb – osm.org/node/11642174693 via StreetComplete 60.3:

The footpath doesn't lead to a curb here; it goes around the loop and there's a crossing over to the bus station path.

Attached photo(s):
https://streetcomplete.app/p/294215.jpg

Unable to answer "Do these steps have a ramp? What kind?" – on bridge: Steps – osm.org/way/151513758 via StreetComplete 60.3:

Not steps, just a ramp

Attached photo(s):
https://streetcomplete.app/p/293857.jpg

Unable to answer "This shop has been vacant. What’s here now?" – house number 60 – osm.org/node/3542170057 via StreetComplete 60.3:

It's part of Little Petra now

Unable to answer "This shop has been vacant. What’s here now?" – osm.org/node/2815911228 via StreetComplete 60.3:

Converted to residential

Attached photo(s):
https://streetcomplete.app/p/291644.jpg

Unable to answer "Which direction leads upwards here?" – Escalator – osm.org/way/375390197 via StreetComplete 60.3:

There's two escalators, up & down.
Also, they're oriented the other way, roughly N-S

Attached photo(s):
https://streetcomplete.app/p/289967.jpg

Unable to answer "This shop has been vacant. What’s here now?" – house number 55 – osm.org/node/9004798425 via StreetComplete 60.3:

This means house 58. Number 55 would be on the opposite side.
Yes, it's still vacant.

Attached photo(s):
https://streetcomplete.app/p/289984.jpg

Unable to answer "What’s the surface here?" – Area – osm.org/way/244840467 via StreetComplete 60.3:

It's a path on a yard

Attached photo(s):
https://streetcomplete.app/p/288144.jpg