Having a house sitter has several benefits - here's a few:
Pets; keep your pets in their own environment with their usual daily comforts; cuddles, warmth, their own bed - whatever they're used to and keeps them happy......and not focused on missing you!
Security; your home keeps that lived in look - someone is at home to answer the door, lights are on, a car is in the driveway, washing on the line, letterbox cleared.
Your home retains your green touch; plants can be watered, lawns can even be mowed!