The house mentioned above is on the Brunngasse 8 - 8001 Zürich

http://www.stadt-zuerich.ch/content/...nngasse_8.html

Then turn the corner - you'll be on the Froschaugasse - go to nr. 4
it's a Music shop - enter - at the back - look on the wall - and you'll
see mural painting from 1300 - was once a synagogue.