My parents bought this car around 2008 and I got it a couple years later. The vehicles interior is rather nice, the model I had included leather seats and the front ones were heated with the push of a button. My only issue with the interior was that after about 2012 (which to be fair, was when the car was 8 years old) the cars leather seats began to finally crack and dry out. The plastic knobs which controlled the a/c, sunroof, lights, etc. began to look worn out around the 8 year mark as-well. Around 2012 I'd say there was about 200,000 KM (or 124,274 Miles) on it, is when you could really begin to notice the interior wearing out.
The Ford Focus's biggest issue by far was its horrendous wiring. The wiring had been an issue since my family had acquired the station wagon back in 2008. The hatch on the back would frequently fail the latch closed. Close it too hard, it would bounce back up slightly and not close, too light and it would not close, even if you closed it properly it still might not close. Worst of all was that back in 2015, the wiring in hatch got frayed and worn out at the joint where the hatch pivots on. This caused (somehow) the hatch to open itself whenever the brakes got pressed. This is because the wiring to pop open the hatch and the wiring for the brake lights run through the same small joint to reach the hatch itself. Another thing that gave me grief was the ABS system. In order to fix the ABS target on these station wagons, you have to take apart the wheel baring with a hydraulic press. It is a nightmare to do. Another thing was the sunroof, when ever I'd go to close it, the thing would close about half way and then stop, and then open again. But then I'd press the button to close it the second time and it would close fully. Finally, the alternator always seemed to be breaking down on this thing every 3 years or so, I would also change the battery at this time as-well.
Despite some issues, it was a pretty good car that lasted 13+ years.