@David-and-Fiona0
I would be very happy - it's like a good guest recommending your place to friends (assuming all is well with what they say!)
They didn't ask for a freebie, they were lovely people, they are giving you great advertising - I don't see any issue here unless you don't want the advertising - in which case you could ask them to take it down, but thank them for sharing your property. Seems like they are travel bloggers....I guess you could say they should have asked first but...