I am sure many other properties have had a neighbour who started noisy building work just as your guests arrive to enjoy a peaceful holiday. (I apologise if this topic has already been discussed - I could not find anything).
We had the property adjacent to us demolished, then excavated by a pneumatic digger to make a hole for a basement, and we are now in the construction phase with brick slicing and cement trucks arriving. This is compounded by the arrival of chatting builders at 06:30 to start at 07:00am accompanied by the obligatory builder's radio noise. We have survived to-date and are now in the 'not so noisy phase' - the pneumatic digger being the worse as it made our building vibrate!
We initially tried warning people before they arrived, and that led to a cancellation. To our annoyance, the building site was silent for the week as they decided not to come but worked on another of their sites! As you can imagine, that was not the ideal decision. We then opted for playing it by ear and consoling guests who were upset. I found talking to guests about how we attempted to oppose the work and our struggles to have it postponed until the off peak season which failed as the demolished property was not on the official designated tourist road (being the road with the sea view) but in a side road instead. We got some sympathy and some guests did not even mention it in their reviews - for which we were grateful.
In short - I would be interested to hear how others have coped with this type of thing. Our solution was to engage the guest with the details expressing how we really did not know from day to day what disruption there could be (which is true - after cement pouring it goes quiet for three weeks!).