Knox supposedly spent the night elsewhere, at Sollecito's flat.
Guede's DNA was found ON and INSIDE the body. .. plus on her bra, handbag, etc.
The Knox/Sollecito DNA evidence was found on a severed piece of Kercher's bra, including the snaps.
Prosectors said that Knox's DNA was found on a knife at Sollecito's flat and Kercher's DNA was supposedly on the blade, but the court-appointed forensics experts said the Kercher's DNA on the blade was unreliable.
There was no direct evidence Knox had been in Kercher's bedroom. Knox's fingerprints were not found in either bedroom.
More here, that can be used as a jump-off point:
... as a tongue-in-cheek piece of logic, wouldn't Nancy Grace's assertion that the successful appeal was a horrific miscarriage of justice suggest that Knox is innocent?