@Mi-Casa-Es-Tu-Casa1 , @Lorina14 has some great wordings to use. My guidelines would be:
1. take the emotion out; facts only if it was a problematic stay
2. short and sweet if it was good or great
3. rely on the star ratings rather than too many words to make any serious negative points (if needed)
4. try not to leave any negative guest comments unanswered- ie so you can confirm its been fixed, reviewed etc or just thank them for their feedback.
5. Remember your review responses are for the next guests to read and judge.