Ask at checkout, in person
The moment of departure, after a good stay, is when a guest is most willing. A QR code at reception converts far better than an email sent three days later.
Make it one tap
Use the short Google review link. Every extra step loses a large share of people.
Reply to everything
Reply to positive reviews briefly and to negative ones with specifics about what changed. Future guests read the replies as closely as the reviews.
Never buy reviews
Platforms detect it, penalties are severe, and guests can usually tell. It is not worth the risk.