How long will you be away?
I assume you have someone coming in to deliver food and water and check on the litter box.
I would leave a light on somewhere but mostly let natural light suffice. Don’t leave any noisemaker such as a radio or TV. Cats like quiet.
If there is something of yours that he is particularly attached to—slippers, a blanket, something that has your scent—I would be sure to leave it out and accessible. But there is no way around the fact that he will be lonely. Your look-in person will probably not see him at all, much less get to cuddle him. He will want you and only you.
Expect to be punished when you get home. My two used to wait until I got home and then tip over all the wastebaskets and scatter the contents. Also they did throw up around the house, although they never failed to use the litter box. After my return it would sometimes be two days before they would speak to me again.
We have also boarded cats at the vet. I felt the most secure but the least comfortable with that. I was always worried when they stayed home that they would get past the caregiver and be stranded outside. But when we’ve picked them up at the vet they were always so sad and grateful that it really wrung my heart.