1. Reviews that appear at the top are usually "upvoted" by users, indicating their usefulness. Users can click on a review to upvote it as useful or not. Responding to reviews does not directly impact their position. However, it can make users feel heard, potentially leading them to update their rating to a more positive one.

2. Long-pressing a review allows users to mark it as helpful or unhelpful. Reviews marked as helpful may be shown at the top.