Unfortunatley review websites are ruining a lot of businesses and there was TV programme about this last year involving restaurants.
Thankfully most people are sensible and ignore most reviews
Tadd1966, I can back you up with this, two years ago I went to a family meal at a pub / restaurant many miles away from me, the pub was great, clean tidy, staff couldn't have been more helpful, we stayed all day from about 11am to late, bar and restaurant, next day someone mentioned that this place was on Trip Advisor, now I don't normally do or read these things but this time I did have a look, a certain chap who said he was in this pub on the same day as us completely downed the place, staff didn't care, next to no people in the place, empty seats, scruffy bar etc etc, the moaning list went on.
You had to read it a couple of times over to see if it was the same place, time and day as we all went to.
The person that complained about the holiday let is probably one of those that does this sort of thing all the time in the hope that the owners cave in and refund some money....
Advice to LindaLane is tell them to get stuffed and do your worst, any publicity is better then no publicity, anyway LindaLane you can always respond that you went to your own house for a holiday, use a different name, report how great it was and make mention (Name) the other person didn't know what they were talking about, bounce the threat back.