Hi Nanda,
many thanks for the information, though unfortunately none of the places mentioned are in my area (near Schaffhauser Platz).

I ended up putting my two furry friends in "Katzen Pension Heuried". It seemed fine, though they were a bit stressed out when they first came back home. After a day back home they were fine again.

Cats hate travelling...

Thanks again and have a nice day!
Neonfish