I've been at Kao's one Friday evening in April 2014. The place was crowded (basically with fixie hipsters and the like), but I was fortunate enough to find a free table and ordered a burger with sweet potato fries and salad.
The serving was rather small and the food (which came after a 20 minutes' wait) wasn't exactly hot. The burger had no taste whatsoever and was rather dry. The cold gravy (basic ketchup and some sort of sour cream) had no taste either. Everything was lacking herbs and spices, let alone salt and pepper. The salad (trite green salad and raw red cabbage) came without dressing.
Considering quantity and quality, the menu was rather expensive.
Personally, I will not eat at Kao's again when visiting Malmö the next time.