Cannot please everyone, all the time.

You can try, but it is impossible. Some people are very hard to please. It has nothing to do with you. It is them, most of the time.

It might come up as a legitimate complain, but once you start talking to them, or if they stay for more than a night you will realize that this is how they treat most of the things in their world.

It can come in many different ways. "The room is fine but....the smell, the noise, the shower curtain, the color of the floor....Don't get me wrong, we treat each remark with the utmost seriousness. We check it up, think about it. Many times even make some changes if it make sense and it is practical. We actually ask people to tell us if everything is OK. Being a guest you see things in a different way so it is very helpful when people tell us what they think. I am also not talking about all those people who are very grumpy at check-in time as we realize that many times they are just tired and the next morning they will be different and relaxed. No, it those people that no matter what you do or say will remain unsatisfied. We learn to tone it down, keep smiling, and wait for them to leave.