I have been reading the forums a lot lately and it's given me some very good insight as to how to deal with situations like this but I would like to know know how you plan to proceed. In my opinion you did the right thing, however I would give myself around 10 minute window before and after the agreed time of the appointment at least rather than leaving giving up straight away. I would also hear about her end of the story too, after all, it could always be a perfectly reasonable personal reason for things going astray. If it can't be resolved, an N/A seems more appropriate than a negative review as I think it's more fair from an objective point of view.