Love this feedback. Here’s a warm, professional reply you can post straight back:
---
Thank you Rob for the lovely feedback. It really means a lot. This was a challenging role and I genuinely appreciated how open and clear you were with your feedback along the way. That collaboration made all the difference and I am so pleased we landed the right person in the end. It was a real pleasure working with you and I look forward to partnering with you again in the future.