@Mary1660
It could be paranoia... You wouldn't be bothered if the couple wanted to take selfies all over your place, so how could having someone there to hold their camera for them and make your place look real cool be a problem?
Many Instagram celebrities hit up free accommodation and dining in order that the resort gets featured in their 'selfies' and on a smaller scale I don't think the publicity generated by this couple wouldn't do any harm when it gets communicated with their friends. Whether your place can be identified by the photos is irrelevant - you have it advertised on the internet and your guests will be telling people where they are anyway, so you have nothing to hide. It would benefit you to be advertised as a romantic retreat, I'm sure.
I'm a professional photographer and was photographing a board meeting last week - portraits and members of the board type stuff... the owner of the venue actually wanted recognition that the photos were taken at that venue.. ?! (Why? The venue wasn't even shown). Just marketing.
I mention to guests that we have a Facebook page, some 'check-in'. All their friends know where we are then (and can find us if they want to stay). All/most establishments have this sort of facility. I don't understand the necessity of hiding your location.
I photographed a wedding once for a couple who eloped, it was great! I was one of 7 people at the wedding. I believe it could only be one less if the registrar actually did the marriage service too what with the necessity of 2 witnesses and the bride and groom. They had a full wedding album of just photos of them and the hotel staff who stood in for witnesses.
I wouldn't think it a scam to want a photographer to take photos, you might even insist that you get credited as the location.