In context of overlay "Things" – Trash Can – node/12575313719 via StreetComplete 61.1:

Waste separation, maybe mapped a little incorrectly as three trashcans?

Unable to answer "Is the water potable here?" – Water Tap – node/2773995873 via StreetComplete 61.1:

Not usable/disused

In context of overlay "Things" – Drinking Water – node/2773995652 via StreetComplete 61.1:

Disused

Attached photo(s):
https://streetcomplete.app/p/284269.jpg

Unable to answer "How many bicycles can be parked here?" – Bicycle Parking – node/2704329823 via StreetComplete 61.1:

Not there? Just seating from restaurants

Unable to answer "What’s the surface quality of this road here?" – on bridge: Baross téri felüljáró (Tertiary Road) – way/1346442435 via StreetComplete 61.1:

Should probably be mapped as one Street with three lanes

Unable to answer "What’s the surface here?" – Foot Path – way/1394545963 via StreetComplete 61.1:

Tartan

Attached photo(s):
https://streetcomplete.app/p/283964.jpg

Way missing

via StreetComplete 61.1

Attached photo(s):
https://streetcomplete.app/p/283754.jpg
https://streetcomplete.app/p/283755.jpg

GPS Trace: @YieldMapper/traces/11999156

Barrier

via StreetComplete 61.1

Attached photo(s):
https://streetcomplete.app/p/283345.jpg

Unable to answer "How many levels above the basement does this building have?" – house number 31: Residential Building – way/202817695 via StreetComplete 61.1:

Building demolished

Attached photo(s):
https://streetcomplete.app/p/283335.jpg

Unable to answer "How many bicycles can be parked here?" – Bicycle Parking – node/11559578076 via StreetComplete 61.1:

Hmm?