Originally Posted by Polytonic

There's the 4NF thread, Citi Prestige 4th night free hotel benefit September 2019 and beyond

Realistically, now that it's done through some online portal (Expedia?) where the prices are often higher than what you see compared to booking direct, it's "4NF in name only" since you end up paying a slightly higher rate that is then discounted. At least, that's been my experience anyway. Maybe if you book a lot of high end boutique hotels that aren't on any other travel portal ... judging by the laundry list of programmes in your profile, I'm guessing you're probably booking with chains for elite benefits.