Possible causes;
Next door neighbour's bins. Annoying but not your issue to fix.
Dishwasher filter/other side of the filter in the pump. Solution is to take filter out, clean it, get any food scraps out of the exit and threaten any other residents with murder if they fail to scrape plates off properly before placing in the dishwasher.
Shower filter. Four screws - don't drop them, put them straight into a large, flat container with decent raised edges, lift the cover, try not to puke, clean residue from around the underside, poke down as far as you can go and chuck in a litre of boiling water.
Kitchen sink partially blocked. Check how quickly it drains with boiling water. If it starts speeding up, there's a good chance there's solid fat down there mixing with odd bits of pasta and vegetables. Or just pasta. Rotten pasta smells like death.
U-bend under sink is blocked from liquid detergent coming from the washing machine, gone mouldy and is causing a back up of waste water/food particles from the dishwasher. Yes, I am being very specific here. It involves a bucket, hot water, Fairy Liquid, an unfolded metal coathanger, rubber gloves and the ability to breathe through your mouth for about half an hour.
The worst case is that the next neighbours along the communal sewer have blocked it with cooking fat and baby wipes or it's collapsed. Try flushing the toilets and check that the additional water actually all disappears quickly.