Hi Isabelle, I'm sure that I'm not alone in telling you that we all feel the sting of mediocre or less review, especially when we've put so much effort into hosting guests.
I've changed my style drastically, as it was taking too much of an emotional toll on me to put out so much energy and not have it returned. Also, I have a number of listings so it's just not possible to offer as much as I used to. Now I treat my business like a boutique hotel. I want to offer solid value, make it a memorable experience, and exceed expectations. But that no longer means chatting for hours with guests, sharing special things like a favorite scotch, making them cookies, etc. Now it means making sure that I deliver what I promise, offer small gestures of kindness if it happens (fresh flowers for a birthday, a fresh loaf of bread if I'm making them and have an extra, etc) but no longer going over and above.
Some guests do become good friends, others are your best friend while you're showering them with things, and forget you exist the minute the door closes. I hope you have more of the first kind!