Unable to answer "Is this still here?" – Bicycle Repair Tool Stand – node/5446688083 via StreetComplete 63.1:

It is just a bicycle tire pump.

Unable to answer "How many bicycles can be charged here at the same time?" – Hotel Katharinenhof (Charging Station) – node/12351224840 via StreetComplete 63.1:

There are only car chargers at this place.

Attached photo(s):
https://streetcomplete.app/p/348269.jpg

Unable to answer "What are the opening hours here?" – Bicycle Parking Garage – node/7506300630 via StreetComplete 63.1:

This is not a garage. This is a bicycle stand covered with a roof.As a consequence, it can not be closed; always open.

Unable to answer "What’s the house number of this building?" – Detached House – way/596655621 via StreetComplete 61.1:

This house belongs to housenumber 7. How do I map that?

Unable to answer "What’s the house number of this building?" – Apartment Building – way/596655620 via StreetComplete 61.1:

This house belongs to housenumber 9. How do I map that?

Unable to answer "Where is this fire hydrant located?" – Underground Fire Hydrant – node/12581950067 via StreetComplete 61.2:

Can't find it.

Unable to answer "What’s the surface here?" – Informal Path – way/1394562423 via StreetComplete 60.3:

I cannot see this path; only a high grown meadow.

Unable to answer "What diameter is specified on the sign for this fire hydrant?" – Underground Fire Hydrant – node/12766424199 via StreetComplete 60.3:

This hydrant belongs to the other side(walk) of the road!

Unable to answer "Who is allowed to park a bicycle here? Parking may be free or paid." – Bicycle Parking Garage – way/1272032352 via StreetComplete 61.3:

I cannot see a bicycle parking garage. Does it only exist in OSM but not for real?

Unable to answer "How is this power line attached?" – Power Pole – node/7633186869 via StreetComplete 61.2:

I cannot see this very object with my own eyes standing next to it.