Six days are a long time when a volcano erupts and plans go crazy. My guests were unable to leave Venice and stayed an extra five nights in the apartment. The next ones were unable to arrive.
Nightmare. Now I find I cannot go myself as my flight is cancelled, but hopefully all will be well in the next six days, in  time for the next guests. At least Venice is a rather more desirable place to find oneself than an airport or port. I sincerely hope nothing like this ever happens again, but will do all I can to  give support in an emergency.