Sonia and Pablos place is great!
Right on the river, a 5 minute walk from Zurich HB which is super convenient.
Sonia and Pablo were extremely responsive, polite and kind.
Check in was smooth, the place was spotless and over all great.
The one "down side" it may have is that the location (being the center of town) does mean there's noise. I don't really care about that, so it didn't bother me, but if you're looking for something quiet, this might not work.