We have two dogs and two cats that are fairly good when left on their own, but do need regular check-ins plus dog-walking. Four visits (1-2 including dog walking) would be the minimum requirement. Staying overnight would be ideal.

Koopa is a 9 year-old cattle-dog/lab mix. He needs special food/treats & is not socialized to other dogs (no aggression, but a lot of barking and posturing).
Gus is a 3 year-old beagle. He is a beagle through and through (sweet and stubborn) and has learned some bad leash habits from our older dog, but goes to daycare and is well-socialized to other dogs.
Kraken is our 11 year old tabby. He is mischievous but fun.
Kevin is our 8 year year old black cat. He likes to snuggle and is not a huge fan of being alone.