Hi @tamsin I had to chuckle as at first I read your post as though it was also the cat’s graduation. I thought maybe Sylvester had been for obedience training. 
The answers to your questions would likely be as varied as the THS sitters. Many sitters appreciate short sits to fill gaps in their schedules. Others see them as an opportunity to gain their first review.
You are best to focus on making sure your listing is top notch. I’ll add a link to the blog post on creating the perfect listing. Check and see if you can improve yours at all. For example, when I do a search all that displays of your heading is ‘look after our young cat &’. Perhaps think about your best feature and use the headline more effectively.
You may also want to review Angela’s 10 tips for a successful listing.
Francine,
Voluntary Forum Moderator