It smells like burning flesh, combined with decomposing odor, very very unpleasant. Once you saw the actual human remains, you'll puke. A guy was electrocuted to death and part of his body is charred, and you can still see the smoke coming from the chars.
It is more unpleasant than drowning corpse odor. There were 4 guys drowned inside a parking area at basement level during the last city-wide flooding. They were left there until the food subsided 5 days later. 3 weeks after the event, the smell still remains. When you exit your car, you'll immediately smell shit, fishy odor, and all that disgusting stuff.