This issue is easy and looking for a contributor, just add a comment saying you'll do it's yours!
Not sure where to start from? Take a look at our First steps as a contributor and Contributing 101 wiki pages.
Other interesting tasks which can be completed by new w3af contributors can be found here.
The report template I've drafted is properly rendered but, as usual, ugly. These are some of the things I would like others to improve.
I have done a lot of this out of personal necessity.
I will clean it up and issue a PR.
@Mruocco sounds good! Please do!