Unable to answer "Is this still here?" – Dresden Villa (Guest House) – osm.org/way/172917585 via StreetComplete 59.2:

St Andrew's College Hall of Residence now

Unable to answer "What diameter is specified on the sign for this fire hydrant?" for osm.org/node/9935850866 via StreetComplete 54.1:

I can't actually find this fire hydrant, unless it's hidden in the plants.