Badergasse goes from Limmatquai to Niederdorfstrasse. It is named after the public baths that used to be on that street.
The tower with the round roof in the background is the Urania observatory.
"The 3 carps". I've seen one reference that this might have been a fish market building, but I wasn't able to confirm it in any way.
Nope, no idea what this guy is doing here. And is he holding a chicken? (I think so?)