The first twenty minutes are entertaining and I wanted to see what's next. Unfortunately there's nothing next. Main character (not at his best) speaks to many people on the phone and most of them get killed, then some zombies arrives to him but he's stuck in the elevator and he's able to stay safe. Then Marcello the policeman pop up and he's like the most italian (roman) guy in the world, but he acts like he just escaped from an american horror movie (and this pretending to be american is one of the most common errors in italian movies). And so on, nothing is really developed in this movie and it's the same from start to end.
Like always: it could have be a decent italian horror movie, but not this time.