How do you know which room to renovate?

Room Renovation: This is the simplest type of gig that you’ll be starting out with. Clients will ask you to redesign one room in their home for them. Sometimes they will ask you to renovate a specific room in their home, like their child’s bedroom or the kitchen. Other times, they’ll let you pick which room in their home needs the most help.

More info here.
https://simscommunity.info/2021/06/01/the-sims-4-dream-home-decorator-guide-to-gigs/