The piece handles a nightmare of so many. You get a miserable neighbour that ruins your life by just being an absolute bell end.
While the portrayal of disturbance and gradation works well, with occasional artsy depictions of the main characters turning more and more mad, I can't help it but leave the cinema thinking: Wait, what?
The plot stays fairly flat, and you hardly develop deeper emotions beyond basic sympathies. Acting is good, but suffers from a simple script. Audio, especially during phone calls, tends to be a bit poor, so I had to unusually lean and focus so I hear what's said. Importantly, the somewhat predictable unidimensionality of the characters, places and events is only disturbed by good camera and some suspense. That's not good enough, I'm afraid.
If you find the description of plot interesting and suffer from an off-season poor choice of films like me, maybe go for it. But personally, it's a film I won't remember I've watched when I wake up tomorrow.