Unable to answer "Is this inside a building?" – Telephone – node/11833066376 via StreetComplete 61.3:

Likely refers to a phone that was removed.

Attached photo(s):
https://streetcomplete.app/p/323209.jpg

Unable to answer "On which level number is this place located?" – Euro Café (Cafe) – node/4966837721 via StreetComplete 61.3:

Same floor as the gates. 2nd floor?

Unable to answer "What’s the topic of this information board?" – Engagement (Information Board) – node/9044453700 via StreetComplete 61.3:

Describes a nearby artwork