@Aaa welcome to the forum - sorry that you find yourself in this situation for the second time.
Is this “stench” outside or inside ? Puppies or adult dogs ?
If you are not local to the sit and unable to visit the home beforehand, previous reviews are all you have to go on .
Did any of the previous reviews mention the smell ? Did they have “missing “ reviews - you can only see this on the app .This is sometimes an indication that the sitter had a problem .
For the completed sit where you experienced this before , did you approach this issue in your feedback to warn future sitters ?