We used Futterblitz in January, they were great. The woman came by in advance to have a look around - was very shy and businesslike with us, but lit right up and talked excitedly with our cats. That sold us on the service. Plus, the furballs were in fine form when we came home a week later.
futterblitz@bluewin.ch, Yvonne Neier - that's not a typo, it is actually Neier with an "N".
It cost CHF 40 per day, including watering plants, emptying the mailbox, airing out the apartment, and the all important cleaning out the litter box.