The small part in the upper right corner is actually a separate building (public WC). Two stories tall.

via StreetComplete 35.2

There are lowered curbs, but not where the marked crossing is. The markings are not very well visible, I suspect that's because Via Etnea is a pedestrian-only street now. Thus, the crossing was (re)moved?

via StreetComplete 51.1

Unable to answer "What’s the name of this street?" for osm.org/way/957899802 via StreetComplete 51.1:

This is a pedestrian-only way w/o a name.

The paths inside the area here are completely missing.

via StreetComplete 51.1

Unable to answer "What’s the name of this street?" for osm.org/way/412501782 via StreetComplete 51.1:

It seems there used to be a sign at the corner, but it's gone

Attached photo(s):
https://westnordost.de/p/139664.jpg

Unable to answer "Is drinking water available here? If so, what is its source?" – Drinking Water – osm.org/node/4519278041 via StreetComplete 58.2:

This fountain is not here but one block further away from the Congress

Attached photo(s):
https://westnordost.de/p/248301.jpg

Unable to answer "What’s the name of this street?" – Residential Road – osm.org/way/198553231 via StreetComplete 59.3:

This is the straight connection between the two streets next to the roundabout, but it has no explicit name.

Unable to answer "What height limit is indicated here?" – Railway-Road Crossing – osm.org/node/300866173 via StreetComplete 58.0:

Ebenerdige Kreuzung

Unable to answer "What height limit is indicated here?" – Railway-Road Crossing – osm.org/node/2415878585 via StreetComplete 58.0:

Ebenerdige Kreuzung, keine Brücke oder Unterführung

The Museo Civico Archeologico is in this building. Not sure if/how this is separate from the Museo Civico on the other side of the street

via StreetComplete 51.1