Housing update (yawn)

Just in case anyone else was wondering here's a very brief update on our housing situation (apologies if any readers are getting slightly tired of this subject; same here). Just under a week ago we were poised to sign the contract for the aforementioned apartment with our passports, having passed muster under whatever intense scrutiny had taken place. Then on the morning of the signing I received a call from our otherwise helpful estate agent with a rather sombre note to her voice, informing me that the current tenants were not actually moving out after all so the apartment was no longer available. Shame they waited so long to decide, but wonders will never cease. Thus we are back to square one and are now back on the frenzied trail of the holy grail of Santiago's rental market. How hard can it be?