I have to side with yscleo on this one. However, how the situation is perceived is obviously subjective and people are free to choose whatever course of action they deem reasonable.
From my perspective, yscleo purchased the rights to use the hotel room when he booked the room. It is reasonable to assume that the room would be free of infestation and in usable condition. The fact that the room was not in usable condition deprived yscleo of his right to use said room (along with many other horrible repercussions). Yscleo gave the hotel the opportunity to make things right since the hotel was the one who did not hold up to their end of the agreement. The hotel had the obligation to make yscleo whole. The hotel failed to adequately compensate him (in his eyes) so he wrote a negative review. Hell, I'd say it was rather generous of him to even offer to NOT write a review. I personally would be livid if this happened to me, and would still voice my complaints through the appropriate channels online even if I was compensated.
Its not like he sought out Marriott specifically to try to unjustly enrich himself. It would be an entirely different scenario if he knew of the infestation before hand and threatened to publicize it the infestation unless he was provided something in return. I think it is a stretch to call this extortion.
I do plan on writing a review on Vespara with all the details of my experiences, good or bad, even though they compensated me.